diff --git a/src/fuchsia/mod.rs b/src/fuchsia/mod.rs
index 51abedcb8fc10..a282be77eeae9 100644
--- a/src/fuchsia/mod.rs
+++ b/src/fuchsia/mod.rs
@@ -1592,6 +1592,12 @@ pub const LOCK_UN: c_int = 8;
 pub const SS_ONSTACK: c_int = 1;
 pub const SS_DISABLE: c_int = 2;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 4096;
 
 pub const FD_SETSIZE: c_int = 1024;
diff --git a/src/new/linux_uapi/linux/can/j1939.rs b/src/new/linux_uapi/linux/can/j1939.rs
index fdf425ce6c0c1..589d9a04839d3 100644
--- a/src/new/linux_uapi/linux/can/j1939.rs
+++ b/src/new/linux_uapi/linux/can/j1939.rs
@@ -57,4 +57,10 @@ s! {
     }
 }
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const J1939_FILTER_MAX: c_int = 512;
diff --git a/src/new/linux_uapi/linux/can/raw.rs b/src/new/linux_uapi/linux/can/raw.rs
index 470334bd5d147..a7b4a871a4bf2 100644
--- a/src/new/linux_uapi/linux/can/raw.rs
+++ b/src/new/linux_uapi/linux/can/raw.rs
@@ -3,6 +3,12 @@
 pub use crate::linux::can::*;
 
 pub const SOL_CAN_RAW: c_int = SOL_CAN_BASE + CAN_RAW;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const CAN_RAW_FILTER_MAX: c_int = 512;
 
 // FIXME(cleanup): use `c_enum!`, which needs to be adapted to allow omitting a type.
diff --git a/src/new/qurt/limits.rs b/src/new/qurt/limits.rs
index ae1a007ff1c66..998325dfa57b4 100644
--- a/src/new/qurt/limits.rs
+++ b/src/new/qurt/limits.rs
@@ -27,11 +27,29 @@ pub const USHRT_MAX: c_ushort = 65535;
 // POSIX Limits
 pub const ARG_MAX: c_int = 4096;
 pub const CHILD_MAX: c_int = 25;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const LINK_MAX: c_int = 8;
 pub const MAX_CANON: c_int = 255;
 pub const MAX_INPUT: c_int = 255;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NAME_MAX: c_int = 255;
 pub const OPEN_MAX: c_int = 20;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 260;
 pub const PIPE_BUF: c_int = 512;
 pub const STREAM_MAX: c_int = 20;
diff --git a/src/new/qurt/signal.rs b/src/new/qurt/signal.rs
index f525fa15ff29e..91e084bb1634b 100644
--- a/src/new/qurt/signal.rs
+++ b/src/new/qurt/signal.rs
@@ -50,6 +50,12 @@ pub const SIG_SETMASK: c_int = 3;
 pub const POSIX_MSG: c_int = 7;
 pub const POSIX_NOTIF: c_int = 8;
 pub const SIGRTMIN: c_int = 10;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SIGRTMAX: c_int = 32;
 
 // Notification types (from QuRT signal.h)
diff --git a/src/unix/aix/mod.rs b/src/unix/aix/mod.rs
index 987eadf2465cc..467c71777abc8 100644
--- a/src/unix/aix/mod.rs
+++ b/src/unix/aix/mod.rs
@@ -932,6 +932,12 @@ pub const RTAX_IFP: c_int = 4;
 pub const RTAX_IFA: c_int = 5;
 pub const RTAX_AUTHOR: c_int = 6;
 pub const RTAX_BRD: c_int = 7;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTAX_MAX: c_int = 8;
 pub const RTF_UP: c_int = 0x1;
 pub const RTF_GATEWAY: c_int = 0x2;
@@ -1445,6 +1451,12 @@ pub const L_GETPROCINFO: c_int = 7;
 pub const L_GETXINFO: c_int = 8;
 
 // sys/limits.h
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 1023;
 pub const PAGESIZE: c_int = 4096;
 pub const IOV_MAX: c_int = 16;
@@ -1454,13 +1466,55 @@ pub const OPEN_MAX: c_int = 65534;
 pub const MAX_INPUT: c_int = 512;
 pub const MAX_CANON: c_int = 256;
 pub const ARG_MAX: c_int = 1048576;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_BASE_MAX: c_int = 99;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_DIM_MAX: c_int = 0x800;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_SCALE_MAX: c_int = 99;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_STRING_MAX: c_int = 0x800;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const CHARCLASS_NAME_MAX: c_int = 14;
 pub const CHILD_MAX: c_int = 128;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const COLL_WEIGHTS_MAX: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const EXPR_NEST_MAX: c_int = 32;
 pub const NZERO: c_int = 20;
 
@@ -1537,11 +1591,25 @@ pub const SIGSTKSZ: size_t = 4096;
 pub const MINSIGSTKSZ: size_t = 1200;
 
 // sys/params.h
+// FIXME(msrv): when we bump past the MSRV where `expect` and the `reason`
+// parameter to that attribute got stabilized, use that to justfiy that this is
+// not meant to be deprecated, but the value it relies on should be deprecated.
+#[allow(deprecated)]
 pub const MAXPATHLEN: c_int = PATH_MAX + 1;
 pub const MAXSYMLINKS: c_int = 20;
 pub const MAXHOSTNAMELEN: c_int = 256;
 pub const MAXUPRC: c_int = 128;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NGROUPS_MAX: c_ulong = 2048;
+// FIXME(msrv): when we bump past the MSRV where `expect` and the `reason`
+// parameter to that attribute got stabilized, use that to justfiy that this is
+// not meant to be deprecated, but the value it relies on should be deprecated.
+#[allow(deprecated)]
 pub const NGROUPS: c_ulong = NGROUPS_MAX;
 pub const NOFILE: c_int = OPEN_MAX;
 
@@ -1739,6 +1807,12 @@ pub const SIGXCPU: c_int = 24;
 pub const SIGXFSZ: c_int = 25;
 pub const SIGTRAP: c_int = 5;
 pub const SIGCLD: c_int = 20;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SIGRTMAX: c_int = 57;
 pub const SIGRTMIN: c_int = 50;
 pub const SI_USER: c_int = 0;
@@ -1817,6 +1891,12 @@ pub const AF_INET6: c_int = 24;
 pub const AF_INTF: c_int = 20;
 pub const AF_RIF: c_int = 21;
 pub const AF_NDD: c_int = 23;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const AF_MAX: c_int = 30;
 pub const PF_UNSPEC: c_int = AF_UNSPEC;
 pub const PF_UNIX: c_int = AF_UNIX;
@@ -1843,6 +1923,16 @@ pub const PF_RIF: c_int = AF_RIF;
 pub const PF_INTF: c_int = AF_INTF;
 pub const PF_NDD: c_int = AF_NDD;
 pub const PF_INET6: c_int = AF_INET6;
+// FIXME(msrv): when we bump past the MSRV where `expect` and the `reason`
+// parameter to that attribute got stabilized, use that to justfiy that this is
+// both meant to be deprecated, and is defined in terms of a deprecated value.
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PF_MAX: c_int = AF_MAX;
 pub const SF_CLOSE: c_int = 1;
 pub const SF_REUSE: c_int = 2;
diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index 5ce676d2b7c2d..4bbccfb4aefee 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -2014,6 +2014,12 @@ pub const CPU_STATE_USER: c_int = 0;
 pub const CPU_STATE_SYSTEM: c_int = 1;
 pub const CPU_STATE_IDLE: c_int = 2;
 pub const CPU_STATE_NICE: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const CPU_STATE_MAX: c_int = 4;
 
 pub const PROCESSOR_BASIC_INFO: c_int = 1;
@@ -3396,13 +3402,61 @@ pub const HW_TARGET: c_int = 26;
 pub const HW_PRODUCT: c_int = 27;
 pub const HW_MAXID: c_int = 28;
 pub const USER_CS_PATH: c_int = 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_BASE_MAX: c_int = 2;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_DIM_MAX: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_SCALE_MAX: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_STRING_MAX: c_int = 5;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_COLL_WEIGHTS_MAX: c_int = 6;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_EXPR_NEST_MAX: c_int = 7;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_LINE_MAX: c_int = 8;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_RE_DUP_MAX: c_int = 9;
 pub const USER_POSIX2_VERSION: c_int = 10;
 pub const USER_POSIX2_C_BIND: c_int = 11;
@@ -3447,10 +3501,6 @@ pub const SIGEV_THREAD: c_int = 3;
 pub const AIO_CANCELED: c_int = 2;
 pub const AIO_NOTCANCELED: c_int = 4;
 pub const AIO_ALLDONE: c_int = 1;
-#[deprecated(
-    since = "0.2.64",
-    note = "Can vary at runtime.  Use sysconf(3) instead"
-)]
 pub const AIO_LISTIO_MAX: c_int = 16;
 pub const LIO_NOP: c_int = 0;
 pub const LIO_WRITE: c_int = 2;
@@ -3526,6 +3576,12 @@ pub const RTV_SSTHRESH: c_int = 0x20;
 pub const RTV_RTT: c_int = 0x40;
 pub const RTV_RTTVAR: c_int = 0x80;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTAX_MAX: c_int = 8;
 
 pub const KERN_PROCARGS2: c_int = 49;
diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index 386da7de3279d..e1f21e09aad7d 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -641,13 +641,61 @@ pub const HW_MACHINE_PLATFORM: c_int = 12;
 pub const HW_SENSORS: c_int = 13;
 pub const HW_MAXID: c_int = 14;
 pub const USER_CS_PATH: c_int = 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_BASE_MAX: c_int = 2;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_DIM_MAX: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_SCALE_MAX: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_STRING_MAX: c_int = 5;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_COLL_WEIGHTS_MAX: c_int = 6;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_EXPR_NEST_MAX: c_int = 7;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_LINE_MAX: c_int = 8;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_RE_DUP_MAX: c_int = 9;
 pub const USER_POSIX2_VERSION: c_int = 10;
 pub const USER_POSIX2_C_BIND: c_int = 11;
@@ -1168,6 +1216,12 @@ pub const RTM_VERSION: c_int = 7;
 pub const RTAX_MPLS1: c_int = 8;
 pub const RTAX_MPLS2: c_int = 9;
 pub const RTAX_MPLS3: c_int = 10;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTAX_MAX: c_int = 11;
 
 const fn _CMSG_ALIGN(n: usize) -> usize {
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 3a3f8076bb51e..b846be125d397 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -2320,13 +2320,61 @@ pub const HW_MACHINE_ARCH: c_int = 11;
 pub const HW_REALMEM: c_int = 12;
 
 pub const USER_CS_PATH: c_int = 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_BASE_MAX: c_int = 2;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_DIM_MAX: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_SCALE_MAX: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_STRING_MAX: c_int = 5;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_COLL_WEIGHTS_MAX: c_int = 6;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_EXPR_NEST_MAX: c_int = 7;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_LINE_MAX: c_int = 8;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_RE_DUP_MAX: c_int = 9;
 pub const USER_POSIX2_VERSION: c_int = 10;
 pub const USER_POSIX2_C_BIND: c_int = 11;
@@ -2444,6 +2492,12 @@ pub const SO_TS_BINTIME: c_int = 1;
 pub const SO_TS_REALTIME: c_int = 2;
 pub const SO_TS_MONOTONIC: c_int = 3;
 pub const SO_TS_DEFAULT: c_int = SO_TS_REALTIME_MICRO;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SO_TS_CLOCK_MAX: c_int = SO_TS_MONOTONIC;
 
 pub const LOCAL_CREDS: c_int = 2;
@@ -2724,6 +2778,12 @@ pub const IFNET_SLOWHZ: c_int = 1;
 pub const IFAN_ARRIVAL: c_int = 0;
 pub const IFAN_DEPARTURE: c_int = 1;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const IFSTATMAX: c_int = 800;
 
 pub const RSS_FUNC_NONE: c_int = 0;
@@ -3061,6 +3121,12 @@ pub const TCP_PCAP_IN: c_int = 4096;
 pub const TCP_FUNCTION_BLK: c_int = 8192;
 pub const TCP_FUNCTION_ALIAS: c_int = 8193;
 pub const TCP_FASTOPEN_PSK_LEN: c_int = 16;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const TCP_FUNCTION_NAME_LEN_MAX: c_int = 32;
 
 pub const TCP_REUSPORT_LB_NUMA: c_int = 1026;
@@ -3428,6 +3494,12 @@ pub const KKST_STATE_RUNNING: c_int = 2;
 
 // Constants about priority.
 pub const PRI_MIN: c_int = 0;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PRI_MAX: c_int = 255;
 pub const PRI_MIN_ITHD: c_int = PRI_MIN;
 #[deprecated(since = "0.2.133", note = "Not stable across OS versions")]
@@ -3493,6 +3565,10 @@ pub const PRI_MAX_TIMESHARE: c_int = PRI_MIN_IDLE - 1;
 #[allow(deprecated)]
 pub const PUSER: c_int = PRI_MIN_TIMESHARE;
 pub const PRI_MIN_IDLE: c_int = 224;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const PRI_MAX_IDLE: c_int = PRI_MAX;
 
 pub const NZERO: c_int = 0;
@@ -3511,6 +3587,11 @@ pub const CHILD_MAX: c_int = 40;
 /// max command name remembered
 pub const MAXCOMLEN: usize = 19;
 /// max interpreter file name length
+// FIXME(msrv): switch this to use an `expect` and the `reason` attribute
+// parameter once we reach an MSRV were those are stabilized. this is not meant
+// for deprecation, but reading straight from the value that this depends on is
+// considered deprecated behavior.
+#[allow(deprecated)]
 pub const MAXINTERP: c_int = crate::PATH_MAX;
 /// max login name length (incl. NUL)
 pub const MAXLOGNAME: c_int = 33;
@@ -3519,6 +3600,10 @@ pub const MAXUPRC: c_int = CHILD_MAX;
 /// max bytes for an exec function
 pub const NCARGS: c_int = ARG_MAX;
 ///  /* max number groups
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const NGROUPS: c_int = NGROUPS_MAX + 1;
 /// max open files per process
 pub const NOFILE: c_int = OPEN_MAX;
@@ -3531,9 +3616,21 @@ pub const MAX_CANON: c_int = 255;
 /// max bytes in terminal input
 pub const MAX_INPUT: c_int = 255;
 /// max bytes in a file name
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NAME_MAX: c_int = 255;
 pub const MAXSYMLINKS: c_int = 32;
 /// max supplemental group id's
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NGROUPS_MAX: c_int = 1023;
 /// max open files per process
 pub const OPEN_MAX: c_int = 64;
@@ -3548,22 +3645,76 @@ pub const _POSIX_SSIZE_MAX: c_int = 32767;
 pub const _POSIX_STREAM_MAX: c_int = 8;
 
 /// max ibase/obase values in bc(1)
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_BASE_MAX: c_int = 99;
 /// max array elements in bc(1)
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_DIM_MAX: c_int = 2048;
 /// max scale value in bc(1)
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_SCALE_MAX: c_int = 99;
 /// max const string length in bc(1)
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const BC_STRING_MAX: c_int = 1000;
 /// max character class name size
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const CHARCLASS_NAME_MAX: c_int = 14;
 /// max weights for order keyword
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const COLL_WEIGHTS_MAX: c_int = 10;
 /// max expressions nested in expr(1)
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const EXPR_NEST_MAX: c_int = 32;
 /// max bytes in an input line
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const LINE_MAX: c_int = 2048;
 /// max RE's in interval notation
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RE_DUP_MAX: c_int = 255;
 
 pub const _POSIX2_BC_BASE_MAX: c_int = 99;
@@ -3971,6 +4122,12 @@ pub const RTF_FIXEDMTU: c_int = 0x80000;
 
 pub const RTM_VERSION: c_int = 5;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTAX_MAX: c_int = 8;
 
 // sys/signal.h
@@ -4018,6 +4175,12 @@ pub const SCTP_PR_SCTP_TTL: c_int = 0x0001;
 pub const SCTP_PR_SCTP_PRIO: c_int = 0x0002;
 pub const SCTP_PR_SCTP_BUF: c_int = SCTP_PR_SCTP_PRIO;
 pub const SCTP_PR_SCTP_RTX: c_int = 0x0003;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SCTP_PR_SCTP_MAX: c_int = SCTP_PR_SCTP_RTX;
 pub const SCTP_PR_SCTP_ALL: c_int = 0x000f;
 
@@ -4100,6 +4263,12 @@ pub const SCTP_ASSOC_SUPPORTS_ASCONF: c_int = 0x03;
 pub const SCTP_ASSOC_SUPPORTS_MULTIBUF: c_int = 0x04;
 pub const SCTP_ASSOC_SUPPORTS_RE_CONFIG: c_int = 0x05;
 pub const SCTP_ASSOC_SUPPORTS_INTERLEAVING: c_int = 0x06;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SCTP_ASSOC_SUPPORTS_MAX: c_int = 0x06;
 
 pub const SCTP_ADDR_AVAILABLE: c_int = 0x0001;
@@ -4317,10 +4486,18 @@ safe_f! {
         PR_SCTP_POLICY(x) == SCTP_PR_SCTP_RTX
     }
 
+    // FIXME(msrv): once we bump MSRV past stabilization of `expect` and
+    // `reason`, use those to mention this value is not meant for deprecation,
+    // but the value it relies on is.
+    #[allow(deprecated)]
     pub const fn PR_SCTP_INVALID_POLICY(x: c_int) -> bool {
         PR_SCTP_POLICY(x) > SCTP_PR_SCTP_MAX
     }
 
+    // FIXME(msrv): once we bump MSRV past stabilization of `expect` and
+    // `reason`, use those to mention this value is not meant for deprecation,
+    // but the value it relies on is.
+    #[allow(deprecated)]
     pub const fn PR_SCTP_VALID_POLICY(x: c_int) -> bool {
         PR_SCTP_POLICY(x) <= SCTP_PR_SCTP_MAX
     }
diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index b8d9e779830d9..0c010bda9fbb0 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -408,10 +408,6 @@ s! {
 // Non-public helper constant
 const SIZEOF_LONG: usize = size_of::<c_long>();
 
-#[deprecated(
-    since = "0.2.64",
-    note = "Can vary at runtime.  Use sysconf(3) instead"
-)]
 pub const AIO_LISTIO_MAX: c_int = 16;
 pub const AIO_CANCELED: c_int = 1;
 pub const AIO_NOTCANCELED: c_int = 2;
diff --git a/src/unix/bsd/mod.rs b/src/unix/bsd/mod.rs
index 74a6fa8142b27..730cd43c0396c 100644
--- a/src/unix/bsd/mod.rs
+++ b/src/unix/bsd/mod.rs
@@ -163,7 +163,17 @@ pub const FIOASYNC: c_ulong = 0x8004667d;
 pub const FIOSETOWN: c_ulong = 0x8004667c;
 pub const FIOGETOWN: c_ulong = 0x4004667b;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 1024;
+// FIXME(msrv): when we bump past the MSRV where `expect` and the `reason`
+// parameter to that attribute got stabilized, use that to justfiy that this is
+// not meant to be deprecated, but the value it relies on should be deprecated.
+#[allow(deprecated)]
 pub const MAXPATHLEN: c_int = PATH_MAX;
 
 pub const IOV_MAX: c_int = 1024;
diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index 50e45dbebe737..5c4d3a87c9345 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -1715,6 +1715,12 @@ pub const KVME_FLAG_PAGEABLE: c_int = 0x000000008;
 pub const KVME_FLAG_GROWS_UP: c_int = 0x000000010;
 pub const KVME_FLAG_GROWS_DOWN: c_int = 0x000000020;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NGROUPS_MAX: c_int = 16;
 
 pub const KI_NGROUPS: c_int = 16;
@@ -1791,6 +1797,12 @@ pub const RTM_CHGADDR: c_int = 0x18;
 pub const RTA_TAG: c_int = 0x100;
 
 pub const RTAX_TAG: c_int = 8;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTAX_MAX: c_int = 9;
 
 // For eventfd
diff --git a/src/unix/bsd/netbsdlike/openbsd/mod.rs b/src/unix/bsd/netbsdlike/openbsd/mod.rs
index e642ef18ebc27..df3d51c04dabc 100644
--- a/src/unix/bsd/netbsdlike/openbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/openbsd/mod.rs
@@ -1507,6 +1507,12 @@ pub const ISOFSMNT_EXTATT: c_int = 0x4; // enable extended attr
 pub const ISOFSMNT_NOJOLIET: c_int = 0x8; // disable Joliet Ext
 pub const ISOFSMNT_SESS: c_int = 0x10; // use iso_args.sess
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NFS_ARGSVERSION: c_int = 4; // change when nfs_args changes
 
 pub const NFSMNT_RESVPORT: c_int = 0; // always use reserved ports
@@ -1814,6 +1820,12 @@ pub const RTAX_BFD: c_int = 11;
 pub const RTAX_DNS: c_int = 12;
 pub const RTAX_STATIC: c_int = 13;
 pub const RTAX_SEARCH: c_int = 14;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTAX_MAX: c_int = 15;
 
 const fn _ALIGN(p: usize) -> usize {
diff --git a/src/unix/cygwin/mod.rs b/src/unix/cygwin/mod.rs
index 504eec69841e7..e6a771e94a8f4 100644
--- a/src/unix/cygwin/mod.rs
+++ b/src/unix/cygwin/mod.rs
@@ -897,8 +897,20 @@ pub const ARG_MAX: c_int = 32000;
 pub const CHILD_MAX: c_int = 256;
 pub const IOV_MAX: c_int = 1024;
 pub const PTHREAD_STACK_MIN: size_t = 65536;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 4096;
 pub const PIPE_BUF: usize = 4096;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NGROUPS_MAX: c_int = 1024;
 
 pub const FILENAME_MAX: c_int = 4096;
diff --git a/src/unix/haiku/mod.rs b/src/unix/haiku/mod.rs
index 8fae6f704d357..953784d5336f3 100644
--- a/src/unix/haiku/mod.rs
+++ b/src/unix/haiku/mod.rs
@@ -902,6 +902,12 @@ pub const MINSIGSTKSZ: size_t = 8192;
 pub const SIGSTKSZ: size_t = 16384;
 
 pub const IOV_MAX: c_int = 1024;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 1024;
 
 pub const SA_NOCLDSTOP: c_int = 0x01;
diff --git a/src/unix/haiku/native.rs b/src/unix/haiku/native.rs
index 99ceab8a7519b..8a2076df7e023 100644
--- a/src/unix/haiku/native.rs
+++ b/src/unix/haiku/native.rs
@@ -629,6 +629,11 @@ pub const B_SYMBOL_TYPE_ANY: i32 = 0x5;
 // storage/StorageDefs.h
 pub const B_DEV_NAME_LENGTH: usize = 128;
 pub const B_FILE_NAME_LENGTH: usize = crate::FILENAME_MAX as usize;
+// FIXME(msrv): replace this with an `expect` and a `reason` parameter once we
+// reach an MSRV where those are stable. This constant does not require
+// deprecation, but reading straight from the value that it is defined as is not
+// a good idea.
+#[allow(deprecated)]
 pub const B_PATH_NAME_LENGTH: usize = crate::PATH_MAX as usize;
 pub const B_ATTR_NAME_LENGTH: usize = B_FILE_NAME_LENGTH - 1;
 pub const B_MIME_TYPE_LENGTH: usize = B_ATTR_NAME_LENGTH - 15;
diff --git a/src/unix/hurd/mod.rs b/src/unix/hurd/mod.rs
index af86822c634b3..c178218c53b29 100644
--- a/src/unix/hurd/mod.rs
+++ b/src/unix/hurd/mod.rs
@@ -1230,6 +1230,12 @@ pub const PF_IPX: c_int = 23;
 pub const PF_SIP: c_int = 24;
 pub const PF_PIP: c_int = 25;
 pub const PF_INET6: c_int = 26;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PF_MAX: c_int = 27;
 pub const AF_UNSPEC: c_int = 0;
 pub const AF_LOCAL: c_int = 1;
@@ -1260,6 +1266,12 @@ pub const AF_IPX: c_int = 23;
 pub const AF_SIP: c_int = 24;
 pub const pseudo_AF_PIP: c_int = 25;
 pub const AF_INET6: c_int = 26;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const AF_MAX: c_int = 27;
 pub const SOMAXCONN: c_int = 4096;
 pub const _SS_SIZE: usize = 128;
@@ -1526,7 +1538,19 @@ pub const _POSIX_QLIMIT: usize = 1;
 pub const _POSIX_HIWAT: usize = 512;
 pub const _POSIX_UIO_MAXIOV: usize = 16;
 pub const _POSIX_CLOCKRES_MIN: usize = 20000000;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NAME_MAX: usize = 255;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NGROUPS_MAX: usize = 256;
 pub const _POSIX_THREAD_KEYS_MAX: usize = 128;
 pub const _POSIX_THREAD_DESTRUCTOR_ITERATIONS: usize = 4;
@@ -3207,6 +3231,12 @@ pub const RTLD_DI_PROFILEOUT: c_int = 8;
 pub const RTLD_DI_TLS_MODID: c_int = 9;
 pub const RTLD_DI_TLS_DATA: c_int = 10;
 pub const RTLD_DI_PHDR: c_int = 11;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RTLD_DI_MAX: c_int = 11;
 
 pub const SI_ASYNCIO: c_int = -4;
diff --git a/src/unix/linux_like/android/mod.rs b/src/unix/linux_like/android/mod.rs
index c6dd17697adae..481b6937b3ad1 100644
--- a/src/unix/linux_like/android/mod.rs
+++ b/src/unix/linux_like/android/mod.rs
@@ -1681,6 +1681,12 @@ pub const NFQA_CFG_F_CONNTRACK: c_int = 0x0002;
 pub const NFQA_CFG_F_GSO: c_int = 0x0004;
 pub const NFQA_CFG_F_UID_GID: c_int = 0x0008;
 pub const NFQA_CFG_F_SECCTX: c_int = 0x0010;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NFQA_CFG_F_MAX: c_int = 0x0020;
 
 pub const NFQA_SKB_CSUMNOTREADY: c_int = 0x0001;
@@ -2001,6 +2007,12 @@ pub const NFT_REG_1: c_int = 1;
 pub const NFT_REG_2: c_int = 2;
 pub const NFT_REG_3: c_int = 3;
 pub const NFT_REG_4: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const __NFT_REG_MAX: c_int = 5;
 pub const NFT_REG32_00: c_int = 8;
 pub const NFT_REG32_01: c_int = 9;
@@ -2050,6 +2062,12 @@ pub const NFT_MSG_NEWOBJ: c_int = 18;
 pub const NFT_MSG_GETOBJ: c_int = 19;
 pub const NFT_MSG_DELOBJ: c_int = 20;
 pub const NFT_MSG_GETOBJ_RESET: c_int = 21;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NFT_MSG_MAX: c_int = 25;
 
 pub const NFT_SET_ANONYMOUS: c_int = 0x1;
@@ -2181,31 +2199,151 @@ pub const NFT_NG_INCREMENTAL: c_int = 0;
 pub const NFT_NG_RANDOM: c_int = 1;
 
 // linux/input.h
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const FF_MAX: crate::__u16 = 0x7f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const FF_CNT: usize = FF_MAX as usize + 1;
 
 // linux/input-event-codes.h
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const INPUT_PROP_MAX: crate::__u16 = 0x1f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const INPUT_PROP_CNT: usize = INPUT_PROP_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const EV_MAX: crate::__u16 = 0x1f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const EV_CNT: usize = EV_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SYN_MAX: crate::__u16 = 0xf;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const SYN_CNT: usize = SYN_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const KEY_MAX: crate::__u16 = 0x2ff;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const KEY_CNT: usize = KEY_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const REL_MAX: crate::__u16 = 0x0f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const REL_CNT: usize = REL_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const ABS_MAX: crate::__u16 = 0x3f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const ABS_CNT: usize = ABS_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SW_MAX: crate::__u16 = 0x0f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const SW_CNT: usize = SW_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const MSC_MAX: crate::__u16 = 0x07;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const MSC_CNT: usize = MSC_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const LED_MAX: crate::__u16 = 0x0f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const LED_CNT: usize = LED_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const REP_MAX: crate::__u16 = 0x01;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const REP_CNT: usize = REP_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SND_MAX: crate::__u16 = 0x07;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const SND_CNT: usize = SND_MAX as usize + 1;
 
 // linux/uinput.h
@@ -2825,6 +2963,12 @@ pub const PR_SCHED_CORE_GET: c_int = 0;
 pub const PR_SCHED_CORE_CREATE: c_int = 1;
 pub const PR_SCHED_CORE_SHARE_TO: c_int = 2;
 pub const PR_SCHED_CORE_SHARE_FROM: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PR_SCHED_CORE_MAX: c_int = 4;
 pub const PR_SCHED_CORE_SCOPE_THREAD: c_int = 0;
 pub const PR_SCHED_CORE_SCOPE_THREAD_GROUP: c_int = 1;
@@ -3128,6 +3272,12 @@ pub const KERN_S390_USER_DEBUG_LOGGING: c_int = 51;
 pub const KERN_CORE_USES_PID: c_int = 52;
 pub const KERN_TAINTED: c_int = 53;
 pub const KERN_CADPID: c_int = 54;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const KERN_PIDMAX: c_int = 55;
 pub const KERN_CORE_PATTERN: c_int = 56;
 pub const KERN_PANIC_ON_OOPS: c_int = 57;
@@ -3136,6 +3286,12 @@ pub const KERN_HPPA_UNALIGNED: c_int = 59;
 pub const KERN_PRINTK_RATELIMIT: c_int = 60;
 pub const KERN_PRINTK_RATELIMIT_BURST: c_int = 61;
 pub const KERN_PTY: c_int = 62;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const KERN_NGROUPS_MAX: c_int = 63;
 pub const KERN_SPARC_SCONS_PWROFF: c_int = 64;
 pub const KERN_HZ_TIMER: c_int = 65;
diff --git a/src/unix/linux_like/linux/mod.rs b/src/unix/linux_like/linux/mod.rs
index 4c9392ab2434e..82f0937303e69 100644
--- a/src/unix/linux_like/linux/mod.rs
+++ b/src/unix/linux_like/linux/mod.rs
@@ -1714,6 +1714,12 @@ pub const SKF_AD_VLAN_TAG_PRESENT: c_int = 48;
 pub const SKF_AD_PAY_OFFSET: c_int = 52;
 pub const SKF_AD_RANDOM: c_int = 56;
 pub const SKF_AD_VLAN_TPID: c_int = 60;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SKF_AD_MAX: c_int = 64;
 pub const SKF_NET_OFF: c_int = -0x100000;
 pub const SKF_LL_OFF: c_int = -0x200000;
@@ -2015,6 +2021,12 @@ pub const NFQA_CFG_F_CONNTRACK: c_int = 0x0002;
 pub const NFQA_CFG_F_GSO: c_int = 0x0004;
 pub const NFQA_CFG_F_UID_GID: c_int = 0x0008;
 pub const NFQA_CFG_F_SECCTX: c_int = 0x0010;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NFQA_CFG_F_MAX: c_int = 0x0020;
 
 pub const NFQA_SKB_CSUMNOTREADY: c_int = 0x0001;
@@ -3120,6 +3132,12 @@ pub const NFT_REG_1: c_int = 1;
 pub const NFT_REG_2: c_int = 2;
 pub const NFT_REG_3: c_int = 3;
 pub const NFT_REG_4: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const __NFT_REG_MAX: c_int = 5;
 pub const NFT_REG32_00: c_int = 8;
 pub const NFT_REG32_01: c_int = 9;
@@ -3174,6 +3192,12 @@ cfg_if! {
     }
 }
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NFT_MSG_MAX: c_int = 34;
 
 pub const NFT_SET_ANONYMOUS: c_int = 0x1;
@@ -3304,7 +3328,17 @@ pub const NFT_NG_INCREMENTAL: c_int = 0;
 pub const NFT_NG_RANDOM: c_int = 1;
 
 // linux/input.h
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const FF_MAX: __u16 = 0x7f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const FF_CNT: usize = FF_MAX as usize + 1;
 
 // linux/input-event-codes.h
@@ -3315,27 +3349,137 @@ pub const INPUT_PROP_SEMI_MT: __u16 = 0x03;
 pub const INPUT_PROP_TOPBUTTONPAD: __u16 = 0x04;
 pub const INPUT_PROP_POINTING_STICK: __u16 = 0x05;
 pub const INPUT_PROP_ACCELEROMETER: __u16 = 0x06;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const INPUT_PROP_MAX: __u16 = 0x1f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const INPUT_PROP_CNT: usize = INPUT_PROP_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const EV_MAX: __u16 = 0x1f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const EV_CNT: usize = EV_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SYN_MAX: __u16 = 0xf;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const SYN_CNT: usize = SYN_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const KEY_MAX: __u16 = 0x2ff;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const KEY_CNT: usize = KEY_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const REL_MAX: __u16 = 0x0f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const REL_CNT: usize = REL_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const ABS_MAX: __u16 = 0x3f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const ABS_CNT: usize = ABS_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SW_MAX: __u16 = 0x10;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const SW_CNT: usize = SW_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const MSC_MAX: __u16 = 0x07;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const MSC_CNT: usize = MSC_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const LED_MAX: __u16 = 0x0f;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const LED_CNT: usize = LED_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const REP_MAX: __u16 = 0x01;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const REP_CNT: usize = REP_MAX as usize + 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SND_MAX: __u16 = 0x07;
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const SND_CNT: usize = SND_MAX as usize + 1;
 
 // linux/uinput.h
@@ -3559,6 +3703,12 @@ pub const SCTP_PR_SCTP_NONE: c_int = 0x0000;
 pub const SCTP_PR_SCTP_TTL: c_int = 0x0010;
 pub const SCTP_PR_SCTP_RTX: c_int = 0x0020;
 pub const SCTP_PR_SCTP_PRIO: c_int = 0x0030;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SCTP_PR_SCTP_MAX: c_int = SCTP_PR_SCTP_PRIO;
 pub const SCTP_PR_SCTP_MASK: c_int = 0x0030;
 pub const SCTP_ENABLE_RESET_STREAM_REQ: c_int = 0x01;
@@ -3668,6 +3818,12 @@ pub const KERN_S390_USER_DEBUG_LOGGING: c_int = 51;
 pub const KERN_CORE_USES_PID: c_int = 52;
 pub const KERN_TAINTED: c_int = 53;
 pub const KERN_CADPID: c_int = 54;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const KERN_PIDMAX: c_int = 55;
 pub const KERN_CORE_PATTERN: c_int = 56;
 pub const KERN_PANIC_ON_OOPS: c_int = 57;
@@ -3676,6 +3832,12 @@ pub const KERN_HPPA_UNALIGNED: c_int = 59;
 pub const KERN_PRINTK_RATELIMIT: c_int = 60;
 pub const KERN_PRINTK_RATELIMIT_BURST: c_int = 61;
 pub const KERN_PTY: c_int = 62;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const KERN_NGROUPS_MAX: c_int = 63;
 pub const KERN_SPARC_SCONS_PWROFF: c_int = 64;
 pub const KERN_HZ_TIMER: c_int = 65;
diff --git a/src/unix/linux_like/linux/musl/b32/hexagon.rs b/src/unix/linux_like/linux/musl/b32/hexagon.rs
index 9a62e4d57d6da..4390100937668 100644
--- a/src/unix/linux_like/linux/musl/b32/hexagon.rs
+++ b/src/unix/linux_like/linux/musl/b32/hexagon.rs
@@ -103,6 +103,12 @@ s! {
 
 pub const AF_FILE: c_int = 1;
 pub const AF_KCM: c_int = 41;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const AF_MAX: c_int = 43;
 pub const AF_QIPCRTR: c_int = 42;
 pub const EADDRINUSE: c_int = 98;
@@ -236,6 +242,12 @@ pub const O_SYNC: c_int = 1052672;
 pub const O_RSYNC: c_int = 1052672;
 pub const PF_FILE: c_int = 1;
 pub const PF_KCM: c_int = 41;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PF_MAX: c_int = 43;
 pub const PF_QIPCRTR: c_int = 42;
 pub const SA_ONSTACK: c_int = 0x08000000;
diff --git a/src/unix/linux_like/linux_l4re_shared.rs b/src/unix/linux_like/linux_l4re_shared.rs
index 6b320ff4effa2..9983ab86c586f 100644
--- a/src/unix/linux_like/linux_l4re_shared.rs
+++ b/src/unix/linux_like/linux_l4re_shared.rs
@@ -1175,6 +1175,12 @@ pub const PR_SCHED_CORE_GET: c_int = 0;
 pub const PR_SCHED_CORE_CREATE: c_int = 1;
 pub const PR_SCHED_CORE_SHARE_TO: c_int = 2;
 pub const PR_SCHED_CORE_SHARE_FROM: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PR_SCHED_CORE_MAX: c_int = 4;
 pub const PR_SCHED_CORE_SCOPE_THREAD: c_int = 0;
 pub const PR_SCHED_CORE_SCOPE_THREAD_GROUP: c_int = 1;
@@ -1365,6 +1371,12 @@ pub const RT_CLASS_UNSPEC: u8 = 0;
 pub const RT_CLASS_DEFAULT: u8 = 253;
 pub const RT_CLASS_MAIN: u8 = 254;
 pub const RT_CLASS_LOCAL: u8 = 255;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const RT_CLASS_MAX: u8 = 255;
 
 pub const MAX_ADDR_LEN: usize = 7;
diff --git a/src/unix/linux_like/mod.rs b/src/unix/linux_like/mod.rs
index 7b8397d1c7bad..bce23be30c6f0 100644
--- a/src/unix/linux_like/mod.rs
+++ b/src/unix/linux_like/mod.rs
@@ -1046,7 +1046,19 @@ pub const LOCK_UN: c_int = 8;
 pub const SS_ONSTACK: c_int = 1;
 pub const SS_DISABLE: c_int = 2;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const NAME_MAX: c_int = 255;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 4096;
 
 pub const UIO_MAXIOV: c_int = 1024;
diff --git a/src/unix/newlib/horizon/mod.rs b/src/unix/newlib/horizon/mod.rs
index e94a0bb1c13d8..a940c54f0b218 100644
--- a/src/unix/newlib/horizon/mod.rs
+++ b/src/unix/newlib/horizon/mod.rs
@@ -169,6 +169,12 @@ pub const EAI_SYSTEM: c_int = 11;
 pub const EAI_BADHINTS: c_int = 12;
 pub const EAI_PROTOCOL: c_int = 13;
 pub const EAI_OVERFLOW: c_int = 14;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const EAI_MAX: c_int = 15;
 
 pub const AF_UNIX: c_int = 1;
diff --git a/src/unix/newlib/rtems/mod.rs b/src/unix/newlib/rtems/mod.rs
index ec4534e32a11f..95a09c9362103 100644
--- a/src/unix/newlib/rtems/mod.rs
+++ b/src/unix/newlib/rtems/mod.rs
@@ -56,6 +56,12 @@ pub const SIGWINCH: c_int = 24;
 pub const SIGUSR1: c_int = 25;
 pub const SIGUSR2: c_int = 26;
 pub const SIGRTMIN: c_int = 27;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const SIGRTMAX: c_int = 31;
 pub const SIGXCPU: c_int = 24;
 pub const SIGXFSZ: c_int = 25;
diff --git a/src/unix/nto/mod.rs b/src/unix/nto/mod.rs
index 082e48739fe35..cc35c8a505ed0 100644
--- a/src/unix/nto/mod.rs
+++ b/src/unix/nto/mod.rs
@@ -1154,6 +1154,12 @@ pub const LOCK_UN: c_int = 0x8;
 pub const SS_ONSTACK: c_int = 1;
 pub const SS_DISABLE: c_int = 2;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 1024;
 
 pub const UIO_MAXIOV: c_int = 1024;
@@ -2340,13 +2346,61 @@ pub const TIOCSTOP: c_int = 29807;
 pub const TIOCSWINSZ: c_int = -2146929561;
 
 pub const USER_CS_PATH: c_int = 1;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_BASE_MAX: c_int = 2;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_DIM_MAX: c_int = 3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_SCALE_MAX: c_int = 4;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_BC_STRING_MAX: c_int = 5;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_COLL_WEIGHTS_MAX: c_int = 6;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_EXPR_NEST_MAX: c_int = 7;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_LINE_MAX: c_int = 8;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const USER_RE_DUP_MAX: c_int = 9;
 pub const USER_POSIX2_VERSION: c_int = 10;
 pub const USER_POSIX2_C_BIND: c_int = 11;
diff --git a/src/unix/redox/mod.rs b/src/unix/redox/mod.rs
index 12db71c7a57a5..1c59186e67361 100644
--- a/src/unix/redox/mod.rs
+++ b/src/unix/redox/mod.rs
@@ -333,6 +333,12 @@ cfg_if! {
 }
 
 // limits.h
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 4096;
 
 // fcntl.h
diff --git a/src/unix/solarish/illumos.rs b/src/unix/solarish/illumos.rs
index b31c31bd1f6c8..9ac9875fa240d 100644
--- a/src/unix/solarish/illumos.rs
+++ b/src/unix/solarish/illumos.rs
@@ -109,6 +109,12 @@ pub const FD_CLOFORK: c_int = 2;
 pub const FIL_ATTACH: c_int = 0x1;
 pub const FIL_DETACH: c_int = 0x2;
 pub const FIL_LIST: c_int = 0x3;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const FILNAME_MAX: c_int = 32;
 pub const FILF_PROG: c_int = 0x1;
 pub const FILF_AUTO: c_int = 0x2;
diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index 6c5d183efd54c..f9032f83af6f9 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -823,6 +823,12 @@ pub const NOEXPR: crate::nl_item = 57;
 pub const _DATE_FMT: crate::nl_item = 58;
 pub const MAXSTRMSG: crate::nl_item = 58;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const PATH_MAX: c_int = 1024;
 
 pub const SA_ONSTACK: c_int = 0x00000001;
diff --git a/src/vxworks/mod.rs b/src/vxworks/mod.rs
index 00428543d7aff..2f2f9e01b9e90 100644
--- a/src/vxworks/mod.rs
+++ b/src/vxworks/mod.rs
@@ -577,6 +577,10 @@ s! {
 
 s_no_extra_traits! {
     // dirent.h
+    // FIXME(msrv): once we bump MSRV past stabilization of `expect` and
+    // `reason`, use those to mention this value is not meant for deprecation,
+    // but the value it relies on is.
+    #[allow(deprecated)]
     pub struct dirent {
         pub d_ino: crate::ino_t,
         pub d_name: [c_char; _PARM_NAME_MAX as usize + 1],
@@ -704,6 +708,12 @@ pub const PTHREAD_MUTEX_ERRORCHECK: c_int = 1;
 pub const PTHREAD_MUTEX_RECURSIVE: c_int = 2;
 pub const PTHREAD_MUTEX_DEFAULT: c_int = PTHREAD_MUTEX_NORMAL;
 pub const PTHREAD_STACK_MIN: usize = 4096;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const _PTHREAD_SHARED_SEM_NAME_MAX: usize = 30;
 
 //sched.h
@@ -1043,6 +1053,12 @@ pub const AF_SOCKDEV: c_int = 31;
 pub const AF_TIPC: c_int = 33;
 pub const AF_MIPC: c_int = 34;
 pub const AF_MIPC_SAFE: c_int = 35;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const AF_MAX: c_int = 39;
 
 // termios.h
@@ -1173,6 +1189,16 @@ pub const FIOGETNAME: c_int = 18;
 pub const FIONBIO: c_int = 0x90040010;
 
 // limits.h
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is both meant for deprecation and relies on a
+// deprecated value.
+#[allow(deprecated)]
 pub const PATH_MAX: c_int = _PARM_PATH_MAX;
 pub const _POSIX_PATH_MAX: c_int = 256;
 
@@ -1317,7 +1343,19 @@ pub const AT_REMOVEDIR: c_int = 0x200;
 pub const AT_SYMLINK_FOLLOW: c_int = 0x400;
 
 // vxParams.h definitions
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const _PARM_NAME_MAX: c_int = 255;
+#[deprecated(
+    since = "0.2.187",
+    note = "This constant, among others often used in C for the purposes of denoting the latest \
+            value or limit in a set of constants, has been deprecated. See #3131 for details and \
+            discussion."
+)]
 pub const _PARM_PATH_MAX: c_int = 1024;
 
 // WAIT STUFF
@@ -1332,6 +1370,10 @@ const PTHREAD_MUTEXATTR_INITIALIZER: pthread_mutexattr_t = pthread_mutexattr_t {
     mutexAttrType: PTHREAD_MUTEX_DEFAULT,
     mutexAttrPshared: 1,
 };
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
     mutexSemId: null_mut(),
     mutexValid: PTHREAD_VALID_OBJ,
@@ -1347,6 +1389,10 @@ const PTHREAD_CONDATTR_INITIALIZER: pthread_condattr_t = pthread_condattr_t {
     condAttrPshared: 1,
     condAttrClockId: CLOCK_REALTIME,
 };
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
     condSemId: null_mut(),
     condValid: PTHREAD_VALID_OBJ,
@@ -1363,6 +1409,10 @@ const PTHREAD_RWLOCKATTR_INITIALIZER: pthread_rwlockattr_t = pthread_rwlockattr_
     rwlockAttrMaxReaders: 0,
     rwlockAttrConformOpt: 1,
 };
+// FIXME(msrv): once we bump MSRV past stabilization of `expect` and `reason`,
+// use those to mention this value is not meant for deprecation, but the value
+// it relies on is.
+#[allow(deprecated)]
 pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
     rwlockSemId: null_mut(),
     rwlockReadersRefCount: 0,