A question to "make install"

[Sinsyuan]

Why can't install successfully? It shows the following code:

root@jackychen-VirtualBox:/home/jackychen/vt-cli# make install
go install -ldflags "-X github.com/VirusTotal/vt-cli/cmd.Version=" github.com/VirusTotal/vt-cli/vt
can't load package: package github.com/VirusTotal/vt-cli/vt: cannot find package "github.com/VirusTotal/vt-cli/vt" in any of:
/usr/lib/go-1.10/src/github.com/VirusTotal/vt-cli/vt (from $GOROOT)
/root/go/src/github.com/VirusTotal/vt-cli/vt (from $GOPATH)
Makefile:13: recipe for target 'install' failed
make: *** [install] Error 1
root@jackychen-VirtualBox:/home/jackychen/vt-cli#