Install the Python-2.7.2 mac installer for Lion on Lion.

Then attempt "easy_install -U psutil".  I get:

za-dc-dev/bin/easy_install -U psutil
install_dir /Users/rich/projects/za-packages/za-dependency-checker/za-dc-dev/lib/python2.7/site-packages/
Searching for psutil
Reading http://pypi.python.org/simple/psutil/
Reading http://code.google.com/p/psutil/
Best match: psutil 0.4.0
Downloading http://psutil.googlecode.com/files/psutil-0.4.0.tar.gz
Processing psutil-0.4.0.tar.gz
Running psutil-0.4.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-7euim1/psutil-0.4.0/egg-dist-tmp-QRoCe6
unable to execute gcc-4.2: No such file or directory
error: Setup script exited with error: command 'gcc-4.2' failed with exit status 1
make: *** [za-dc-dev/lib/python2.7/site-packages/psutil-1.1.2-py2.7.egg] Error 1


There is no binary named "gcc-4.2" on my system.  I'm running the latest Xcode, (4.2.1).  And gcc in my PATH is a 4.2 binary:

rich@fuji-land.noir.com> type gcc
gcc is hashed (/usr/bin/gcc)
rich@fuji-land.noir.com> gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


I see no reference to "gcc-4.2" in psutils source nor in distutils.  From this I guess that the python configuration is looking for the same compiler that was used to produce the package, (presumably on osx-10.6).

Other developers tell me that they have a "gcc-4.2" on osx-10.6.  And indeed, downloading and building python-2.7.2 from source results in a python that can download and compile psutil.