How to build Plone 3.x on Mac OS X 10.6 Snow Leopard

GCC Version Problems

If you are trying to buildout Plone 3, say, as per these instructions, and you get this error:

/usr/bin/gcc -I/Users/kim/Plone-3.3.4/Python-2.4/include -fno-strict-aliasing -Wno-long-double -no-cpp-precomp -mno-fused-madd -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -IExtensionClass -I. -IAcquisition -I/Users/kim/Plone-3.3.4/Python-2.4/include/python2.4 -c AccessControl/cAccessControl.c -o build/temp.macosx-10.3-i386-2.4/AccessControl/cAccessControl.o
cc1: error: unrecognized command line option "-Wno-long-double"
error: command '/usr/bin/gcc' 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/kim/src/plonetuneup/plone33devel/eggs/zc.buildout-1.4.3-py2.4.egg/zc/buildout/buildout.py", line 1660, in main
    getattr(buildout, command)(args)
  File "/Users/kim/src/plonetuneup/plone33devel/eggs/zc.buildout-1.4.3-py2.4.egg/zc/buildout/buildout.py", line 532, in install
    installed_files = self[part]._call(recipe.install)
  File "/Users/kim/src/plonetuneup/plone33devel/eggs/zc.buildout-1.4.3-py2.4.egg/zc/buildout/buildout.py", line 1204, in _call
    return f()
  File "/Users/kim/src/plonetuneup/plone33devel/eggs/plone.recipe.zope2install-3.2-py2.4.egg/plone/recipe/zope2install/__init__.py", line 247, in install
    'build_ext', '-i',
AssertionError

The key error message to look for is:

cc1: error: unrecognized command line option "-Wno-long-double"

The quick fix is to invoke buildout as follows:

CC=gcc-4.0 bin/buildout

This is because OS X 10.6 Snow Leopard uses gcc-4.2 and symlinks that to gcc by default. By overriding the CC environment variable you temporarily tell it to use gcc-4.0.

Missing hashlib module

If you build Plone 3.1 via

svn co https://svn.plone.org/svn/plone/buildouts/plone-coredev/branches/3.1/ ./plone31devel

and you get this error:

ImportError: No module named hashlib

The fix is as follows:

CC=gcc-4.0 bin/easy_install hashlib

then continue by reissuing your buildout command:

CC=gcc-4.0 bin/buildout