diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index 5ce676d2b7c2d..e542e1a1f3eba 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -2143,6 +2143,12 @@ pub const ENOTRECOVERABLE: c_int = 104;
 pub const EOWNERDEAD: c_int = 105;
 pub const EQFULL: c_int = 106;
 pub const ENOTCAPABLE: c_int = 107;
+#[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 ELAST: c_int = 107;
 
 pub const EAI_AGAIN: c_int = 2;
diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index 386da7de3279d..488ee394a5c8c 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -548,6 +548,12 @@ pub const ENOMEDIUM: c_int = 93;
 pub const ENOTRECOVERABLE: c_int = 94;
 pub const EOWNERDEAD: c_int = 95;
 pub const EASYNC: 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 ELAST: c_int = 99;
 pub const RLIMIT_POSIXLOCKS: c_int = 11;
 #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd11/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd11/mod.rs
index d9c8c82f32311..dc1e986f774ff 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd11/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd11/mod.rs
@@ -258,6 +258,12 @@ 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 ELAST: c_int = 96;
 pub const RAND_MAX: c_int = 0x7fff_fffd;
 pub const KI_NSPARE_PTR: usize = 6;
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd12/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd12/mod.rs
index 418c1b34f02b7..e92bc64ab4e06 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd12/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd12/mod.rs
@@ -304,6 +304,12 @@ s! {
 }
 
 pub const RAND_MAX: c_int = 0x7fff_fffd;
+#[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 ELAST: c_int = 97;
 
 /// max length of devicename
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
index 3367a1e2be418..38e1f1a3b0d46 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
@@ -317,6 +317,12 @@ s! {
 }
 
 pub const RAND_MAX: c_int = 0x7fff_ffff;
+#[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 ELAST: c_int = 97;
 
 pub const KF_TYPE_EVENTFD: c_int = 13;
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
index 61fa838b5b20e..341af77f1934f 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
@@ -319,6 +319,12 @@ s! {
 }
 
 pub const RAND_MAX: c_int = 0x7fff_ffff;
+#[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 ELAST: c_int = 97;
 
 pub const KF_TYPE_EVENTFD: c_int = 13;
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs
index ca2dcd5c8f4e8..bfd2dfbd38fdd 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs
@@ -321,6 +321,12 @@ s! {
 }
 
 pub const RAND_MAX: c_int = 0x7fff_ffff;
+#[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 ELAST: c_int = 97;
 
 pub const KF_TYPE_EVENTFD: c_int = 13;
diff --git a/src/unix/bsd/netbsdlike/openbsd/mod.rs b/src/unix/bsd/netbsdlike/openbsd/mod.rs
index e642ef18ebc27..46d4654c05bbd 100644
--- a/src/unix/bsd/netbsdlike/openbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/openbsd/mod.rs
@@ -945,6 +945,12 @@ pub const EBADMSG: c_int = 92;
 pub const ENOTRECOVERABLE: c_int = 93;
 pub const EOWNERDEAD: c_int = 94;
 pub const EPROTO: c_int = 95;
+#[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 ELAST: c_int = 95;
 
 pub const F_DUPFD_CLOEXEC: c_int = 10;