unable to `pip install numpy` on a specific machine - numpy

Question

pip install numpy in a python virtualenv on my own Mac OSX machine and on another of my machine running Arch Linux works perfectly.
Unfortunately, the same command fails to work on a colleague's machine running Gentoo.
Here's the pip.log showing the error logs:-
building data_files sources
build_src: building npy-pkg config files
running build_py
copying numpy/version.py -> build/lib.linux-x86_64-2.7/numpy
copying build/src.linux-x86_64-2.7/numpy/__config__.py -> build/lib.linux-x86_64-2.7/numpy
copying build/src.linux-x86_64-2.7/numpy/distutils/__config__.py -> build/lib.linux-x86_64-2.7/numpy/distutils
running build_clib
customize UnixCCompiler
customize UnixCCompiler using build_clib
running build_ext
customize UnixCCompiler
customize UnixCCompiler using build_ext
customize GnuFCompiler
customize IntelFCompiler
customize LaheyFCompiler
customize PGroupFCompiler
customize AbsoftFCompiler
customize NAGFCompiler
customize VastFCompiler
customize CompaqFCompiler
customize IntelItaniumFCompiler
customize IntelEM64TFCompiler
customize Gnu95FCompiler
customize Gnu95FCompiler
customize Gnu95FCompiler using build_ext
building 'numpy.linalg.lapack_lite' extension
compiling C sources
C compiler: x86_64-pc-linux-gnu-gcc -pthread -O3 -march=native -pipe -fomit-frame-pointer -fno-ident -fPIC
compile options: '-DNO_ATLAS_INFO=1 -Inumpy/core/include -Ibuild/src.linux-x86_64-2.7/numpy/core/include/numpy -Inumpy/core/src/private -Inumpy/core/src -Inumpy/core -Inumpy/core/src/npymath -Inumpy/core/src/multiarray -Inumpy/core/src/umath -Inumpy/core/include -I/usr/include/python2.7 -Ibuild/src.linux-x86_64-2.7/numpy/core/src/multiarray -Ibuild/src.linux-x86_64-2.7/numpy/core/src/umath -c'
x86_64-pc-linux-gnu-gcc: numpy/linalg/lapack_litemodule.c
x86_64-pc-linux-gnu-gcc: numpy/linalg/python_xerbla.c
/usr/bin/gfortran -Wall -s build/temp.linux-x86_64-2.7/numpy/linalg/lapack_litemodule.o build/temp.linux-x86_64-2.7/numpy/linalg/python_xerbla.o -L/usr/lib64 -L/usr/lib64 -Lbuild/temp.linux-x86_64-2.7 -llapack -lblas -lpython2.7 -lgfortran -o build/lib.linux-x86_64-2.7/numpy/linalg/lapack_lite.so
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
error: Command "/usr/bin/gfortran -Wall -s build/temp.linux-x86_64-2.7/numpy/linalg/lapack_litemodule.o build/temp.linux-x86_64-2.7/numpy/linalg/python_xerbla.o -L/usr/lib64 -L/usr/lib64 -Lbuild/temp.linux-x86_64-2.7 -llapack -lblas -lpython2.7 -lgfortran -o build/lib.linux-x86_64-2.7/numpy/linalg/lapack_lite.so" failed with exit status 1
----------------------------------------
Command /home/stefan/.virtualenvs/senatus_env/bin/python2.7 -c "import setuptools;__file__='/home/stefan/.virtualenvs/senatus_env/build/numpy/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-Ebkksh-record/install-record.txt --install-headers /home/stefan/.virtualenvs/senatus_env/include/site/python2.7 failed with error code 1 in /home/stefan/.virtualenvs/senatus_env/build/numpy
Exception information:
Traceback (most recent call last):
File "/home/stefan/.virtualenvs/senatus_env/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/basecommand.py", line 104, in main
status = self.run(options, args)
File "/home/stefan/.virtualenvs/senatus_env/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/commands/install.py", line 250, in run
requirement_set.install(install_options, global_options)
File "/home/stefan/.virtualenvs/senatus_env/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 1133, in install
requirement.install(install_options, global_options)
File "/home/stefan/.virtualenvs/senatus_env/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 577, in install
cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
File "/home/stefan/.virtualenvs/senatus_env/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/__init__.py", line 256, in call_subprocess
% (command_desc, proc.returncode, cwd))
InstallationError: Command /home/stefan/.virtualenvs/senatus_env/bin/python2.7 -c "import setuptools;__file__='/home/stefan/.virtualenvs/senatus_env/build/numpy/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-Ebkksh-record/install-record.txt --install-headers /home/stefan/.virtualenvs/senatus_env/include/site/python2.7 failed with error code 1 in /home/stefan/.virtualenvs/senatus_env/build/numpy
It appears that the gfortran on my colleague's machine does not play well with the numpy package he is trying to install in the virtualenv. Any idea why this might be so?

Answer 1

If CFLAGS, CXXFLAGS, or LDFLAGS are set, it could cause this. The problem is that those environment variables override the settings in the compile script, causing problems.
Just unset them for the invocation of the pip command and you should be all set.

Answer 2

It looks to me that setuptools is not working correctly, setuptools has been superceded by the python "dist" utility so you might want to install that and retry the installation.