lang/go 1.7.5 fails to install on Arm

[Peter Jeremy]

I'm trying to install lang/go on a RPi and it's failing because cgo.a is
missing (see below).  Looking through the sources it looks like it should
exist but it's not built and there's no build error.  Can anyone clarify
whether the problem is the port or my build environment?  (And, if the
latter, does anyone have any suggestions what is wrong?)

===>  Installing for go-1.7.5,1
===>  Checking if go already installed
===>   Registering installation for go-1.7.5,1
pkg-static: Unable to access file /usr/obj/usr/ports/lang/go/work/stage/usr/local/go/pkg/freebsd_arm/runtime/cgo.a: No such file or directory
*** Error code 74

Stop.
make: stopped in /usr/ports/lang/go

-- 
Peter Jeremy
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