change go version does not work

[Shirou w]

I'm trying to change go version using goof. goof goinstall was success, but when changing version, this error was occurred.

(go:work) [mypc]%goof go go1.4
sed: first RE may not be empty
[goof] changed GOROOT=/Users/r_rudi/.goenvs/go1.4
_z:16: command not found: mktemp

zsh 5.0.7 (x86_64-apple-darwin13.4.0)

After that, since $PATH becomes empty. command not found: mktemp is shown, I think.

[Shirou w]

sorry, I found reason. I have not set GOROOT.