build constraints exckude all Go files in /root/go/src/github.com/lxn/win

[tf2jaguar]

when i run go get github.com/lxn/win
appears after a while
package github.com/lxn/win : build constraints exckude all Go files in /root/go/src/github.com/lxn/win

is this a problem?

[Soidea]

I got :
..\go\src\github.com\lxn\win\advapi32.go:10:2: cannot find package "golang.org/x/sys/windows" in any of:
C:\Go\src\golang.org\x\sys\windows (from $GOROOT)
C:\Users\name\go\src\golang.org\x\sys\windows (from $GOPATH)
exit status 1
Process exiting with code: 1