[9fans] plan9 from user space on openbsd 4.7 amd64 fails to build

[quiet_lad]

# cd
plan9/
# ./
INSTALL
+ Mailing list: http://groups.google.com/group/plan9port-dev
+ Issue tracker: http://code.swtch.com/plan9port/issues/
+ Submitting changes: http://swtch.com/go/codereview

* Resetting /usr/local/plan9/config
* Compiler version:
        gcc version 3.3.5 (propolice)
* Building mk...
>>> pwd
>>> pwd
>>> pwd
>>> pwd
* Building everything (be patient)...
>>> cd /usr/local/plan9/src/libdraw; mk all
9c  openfont.c
openfont.c:12: warning: `n' might be used uninitialized in this
function
>>> mk: don't know how to make 
>>> '/usr/local/plan9/lib/libthread.a(OpenBSD-x86_64-asm.o)' in 
>>> /usr/local/plan9/src/libthread
mk: for i in ...  : exit status=exit(1)