Please answer these questions before submitting your issue. Thanks! 1. What version of Go are you using (`go version`)? 1.6 2. What operating system and processor architecture are you using (`go env`)? arm, raspbian (raspberry pi 2) 3. What did you do? (Use play.golang.org to provide a runnable example, if possible.) Tried to install golang.org/x/sys/unix 4. What did you expect to see? 5. What did you see instead? It doesn't compile, because TimevalToNsec is missing from https://github.com/golang/sys/blob/master/unix/syscall_linux_arm.go