Estou tentando criar o PIL 1.1.7 no Mac OS X 10.7, estou recebendo este erro:

running build
running build_py
running build_ext
--- using frameworks at /System/Library/Frameworks
building '_imaging' extension
gcc-4.0 -fno-strict-aliasing -fno-common -dynamic -arch ppc -arch i386 -g -O2 -DNDEBUG -g -O3 -DHAVE_LIBZ -I/System/Library/Frameworks/Tcl.framework/Headers -I/System/Library/Frameworks/Tk.framework/Headers -IlibImaging -I/opt/local/include -I/Library/Frameworks/Python.framework/Versions/2.6/include -I/usr/include -I/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c _imaging.c -o build/temp.macosx-10.3-fat-2.6/_imaging.o
unable to execute gcc-4.0: No such file or directory
error: command 'gcc-4.0' failed with exit status 1

Tenho o último Xcode instalado. O gcc-4.0 não existe, mas o gcc-4.2 existe. Não sei por que ele está tentando usar o gcc-4.0.