I am using the virtualenvwrapper and am installing this in a new virtualenv.
I also tried installing it locally but failed with the same error:

/home/webalert/.virtualenvs/mandala/lib/python2.6/site-packages/numpy/core/include/numpy/__multiarray_api.h:1594:
warning: ‘int _import_array()’ defined but not used

error: command 'gcc' failed with exit status 1

----------------------------------------
Command /home/webalert/.virtualenvs/mandala/bin/python -c "import
setuptools;__file__='/home/webalert/.virtualenvs/mandala/build/matplotlib/setup.py';exec(compile(open(__file__).read().replace('\r\n',
'\n'), __file__, 'exec'))" install --record
/tmp/pip-aybCcz-record/install-record.txt
--single-version-externally-managed --install-headers
/home/webalert/.virtualenvs/mandala/include/site/python2.6 failed with error
code 1 in /home/webalert/.virtualenvs/mandala/build/matplotlib
Storing complete log in /home/webalert/.pip/pip.log

And from the pip.log :

   status = self.run(options, args)
  File
"/usr/lib/python2.6/site-packages/pip-1.3.1-py2.6.egg/pip/commands/install.py",
line 271, in run
    requirement_set.install(install_options, global_options,
root=options.root_path)
  File "/usr/lib/python2.6/site-packages/pip-1.3.1-py2.6.egg/pip/req.py",
line 1185, in install
    requirement.install(install_options, global_options, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/pip-1.3.1-py2.6.egg/pip/req.py",
line 592, in install
    cwd=self.source_dir, filter_stdout=self._filter_install,
show_stdout=False)
  File "/usr/lib/python2.6/site-packages/pip-1.3.1-py2.6.egg/pip/util.py",
line 662, in call_subprocess
    % (command_desc, proc.returncode, cwd))
InstallationError: Command /usr/bin/python -c "import
setuptools;__file__='/tmp/pip-build-webalert/matplotlib/setup.py';exec(compile(open(__file__).read().replace('\r\n',
'\n'), __file__, 'exec'))" install --record
/tmp/pip-AnrXxv-record/install-record.txt
--single-version-externally-managed failed with error code 1 in
/tmp/pip-build-webalert/matplotlib


I tried to install "Development Tools", and gcc: yum install gcc-c++
compat-gcc-32 compat-gcc-32-c++

This did not resolve the issue. Is the problem an incompatible version of
numpy? Any help would be appreciated.




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