What version of Go are you using (go version)?

go1.9 windows/amd64

What version of GopherJS are you using ?

GopherJS 1.7 (was attempting to update to 1.9)

What did you do?

go get -u github.com/gopherjs/gopherjs

What did you expect to see?

No errors.

What did you see instead?

..\..\gopherjs\gopherjs\tool.go:768:9: undefined: syscall.Rlimit
..\..\gopherjs\gopherjs\tool.go:769:10: undefined: syscall.Getrlimit
..\..\gopherjs\gopherjs\tool.go:769:28: undefined: syscall.RLIMIT_STACK

Looks like the runtime.GOOS check there needs to be in a file that has a !windows build tag.