The plan9 go port is cross-compilation only. If you install all the
changes needed for it you'll be able to compile go into binaries that
will run on Plan9, but a large part of the OS support is still to be
completed (things like network access, namespace manipulation, stuff
from the "os" package).
At this point I don't think there is a native Go for Plan 9. If you're
looking to help finish it, ask the person who submits the P9 patches
for what help they need.
andrey