Workaround for PR 47241 (bad conditional expression errors during build)

[Luke Maurits <luke%maurits.id.au@localhost>]

Hi list,

I'm trying to build the 6.0 stable branch on 5.1.2, and very early into
the build process (after issuing "./build.sh -O ../obj -T ../tools -U
distribution") I am getting a host of errors along these lines:

nbmake: Bad conditional expression `defined(NOGCCERROR) || (gcc ==
"clang" && defined(NOCLANGERROR))' in defined(NOGCCERROR) || (gcc ==
"clang" && defined(NOCLANGERROR))?yes:no nbmake: Bad conditional
expression ` == "no" ' in  == "no" ?-Werror:

This PR seems relevant:

http://gnats.netbsd.org/47241

and the culprit is apparently an undefined ACTIVE_CC environment
variable.

I have tired exporting ACTIVE_CC=gcc but this doesn't seem to make a
difference.

Does anybody know how to work around this?  That PR is from November
2012, but I am using a freshly checked out source tree.  Surely NetBSD
6 has not been unbuildable for several months?  I am having this
problem on two different machines, so I don't think it's anything
idiosyncratic to my environment.  Both machines are Xen-based VPSes,
though, if that's potentially relevant.

Thanks,
Luke