I have IBUILD:postgresql gsstark$ ls /usr/bin/*gcc* /usr/bin/gcc /usr/bin/gcc-4.0 /usr/bin/gcc-4.2 /usr/bin/i686-apple-darwin9-gcc-4.0.1 /usr/bin/i686-apple-darwin9-gcc-4.2.1 /usr/bin/powerpc-apple-darwin9-gcc-4.0.1 /usr/bin/powerpc-apple-darwin9-gcc-4.2.1
I'm guessing I should do CC=/usr/bin/powerpc-apple-darwin9-gcc-4.2.1 or maybe 4.0.1. What version is on your G4?