So, I was working from a completely fresh virtualenv, installing a package
that had a matplotlib dependency. As it happens to be, the dependencies in
this package lists matplotlib prior to numpy, so matplotlib got processed
first. For whatever reason, while processing matplotlib, it didn't seem to
think that it depended upon NumPy, but failed anyway when it couldn't find
it.  See the following output:

Best match: matplotlib 1.3.0
Downloading
https://downloads.sourceforge.net/project/matplotlib/matplotlib/matplotlib-1.3.0/matplotlib-1.3.0.tar.gz
Processing matplotlib-1.3.0.tar.gz
Writing /tmp/easy_install-ZJ_Xb6/matplotlib-1.3.0/setup.cfg
Running matplotlib-1.3.0/setup.py -q bdist_egg --dist-dir
/tmp/easy_install-ZJ_Xb6/matplotlib-1.3.0/egg-dist-tmp-OqRvd1
============================================================================
Edit setup.cfg to change the build options

BUILDING MATPLOTLIB
            matplotlib: yes [1.3.0]
                python: yes [2.7.1 (r271:86832, Dec  8 2011, 15:48:40)  [GCC
                        4.1.2 20080704 (Red Hat 4.1.2-51)]]
              platform: yes [linux2]

REQUIRED DEPENDENCIES AND EXTENSIONS
error: Setup script exited with Requires numpy 1.5 or later to build.
(Numpy not found)
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/local/CentOS5/lib/python2.7/atexit.py", line 24, in
_run_exitfuncs
    func(*targs, **kargs)
  File "/usr/local/CentOS5/lib/python2.7/multiprocessing/util.py", line
258, in _exit_function
    info('process shutting down')
TypeError: 'NoneType' object is not callable
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/usr/local/CentOS5/lib/python2.7/atexit.py", line 24, in
_run_exitfuncs
    func(*targs, **kargs)
  File "/usr/local/CentOS5/lib/python2.7/multiprocessing/util.py", line
258, in _exit_function
    info('process shutting down')
TypeError: 'NoneType' object is not callable

Thoughts?
Ben Root
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