Recently I found the Python Imaging Library (PIL) would not install properly on my Intel Mac. The error message when trying to install PIL was:
ld: in /Developer/SDKs/MacOSX10.4u.sdk/usr/local/lib/libxml2.2.dylib, file is not of required architecture for architecture ppc
It turned out that
gcc was being called as
gcc -arch ppc -arch i386, which is used to build a universal binary on OS X. Since the installed
libxml2 was Intel-only, and
setuptools did not detect this, the PIL installation failed.
gcc to build only an Intel binary when you install PIL, rather than a universal binary, by setting an environment variable:
sudo env ARCHFLAGS="-arch i386" python setup.py install
Since universal binaries are not needed on Intel Macs unless you are preparing them for distribution, this lets you install PIL normally.