Where does pkgsrc decide on the compiler that it is going to use?

The is an i386 MP box with sources built yesterday. The pkgsrc archive
is from ftp.netbsd.org.

It wants to use i386--netbsdelf-gcc as the compiler, but can't find it.
NetBSD was built with "./build.sh -O /usr/src/obj build".

Another -current box that I finished upgrading two days ago just uses the
system c compiler. That box was built with "./build.sh build".
-- 
Rick Kelly  rmk@rmkhome.com  www.rmkhome.com