Installing zope2.
running build_ext
creating zope.proxy
copying zope/proxy/proxy.h -> zope.proxy
building 'AccessControl.cAccessControl' extension
creating build
creating build/temp.macosx-10.3-i386-2.4
creating build/temp.macosx-10.3-i386-2.4/AccessControl
/usr/bin/gcc-4.0 -fno-strict-aliasing -Wno-long-double -no-cpp-precomp -fno-common -fno-common -dynamic -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -IExtensionClass -I. -IAcquisition -I/opt/local/Library/Frameworks/Python.framework/Versions/2.4/include/python2.4 -c AccessControl/cAccessControl.c -o build/temp.macosx-10.3-i386-2.4/AccessControl/cAccessControl.o
unable to execute /usr/bin/gcc-4.0: No such file or directory
error: command '/usr/bin/gcc-4.0' failed with exit status 1
While:
  Installing zope2.

An internal error occured due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
  File "/Users/fulvio/.buildout/eggs/zc.buildout-1.3.1-py2.4.egg/zc/buildout/buildout.py", line 1519, in main
    getattr(buildout, command)(args)
  File "/Users/fulvio/.buildout/eggs/zc.buildout-1.3.1-py2.4.egg/zc/buildout/buildout.py", line 473, in install
    installed_files = self[part]._call(recipe.install)
  File "/Users/fulvio/.buildout/eggs/zc.buildout-1.3.1-py2.4.egg/zc/buildout/buildout.py", line 1101, in _call
    return f()
  File "/Users/fulvio/.buildout/eggs/plone.recipe.zope2install-3.2-py2.4.egg/plone/recipe/zope2install/__init__.py", line 247, in install
    'build_ext', '-i',
AssertionError