title: Cannot `pip install numpy` on OS X Yosemite
body: <p>I am unable to <code>pip install pandas</code> or <code>pip install numpy</code> after having upgraded to OS X Yosemite. Both commands worked fine before. When I run </p>
  
  <p><code>$ pip install numpy
  </code></p>
  
  <p>the compile process runs for about 30 seconds and then I get this:</p>
  
  <p>compiling C sources</p>
  
  <pre><code>C compiler: cc -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -Qunused-arguments -Qunused-arguments -arch x86_64 -arch i386 -pipe
  
  
  
  creating build/temp.macosx-10.10-intel-2.7/numpy/linalg
  
  creating build/temp.macosx-10.10-intel-2.7/numpy/linalg/lapack_lite
  
  compile options: '-DATLAS_INFO="\"3.9.35\"" -I/opt/local/include -Inumpy/core/include -Ibuild/src.macosx-10.10-intel-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/src/npysort -Inumpy/core/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -Ibuild/src.macosx-10.10-intel-2.7/numpy/core/src/private -Ibuild/src.macosx-10.10-intel-2.7/numpy/core/src/private -Ibuild/src.macosx-10.10-intel-2.7/numpy/core/src/private -Ibuild/src.macosx-10.10-intel-2.7/numpy/core/src/private -c'
  
  cc: numpy/linalg/lapack_lite/python_xerbla.c
  
  cc: numpy/linalg/lapack_litemodule.c
  
  /usr/local/bin/gfortran -Wall -g -arch x86_64 -Wall -g -undefined dynamic_lookup -bundle build/temp.macosx-10.10-intel-2.7/numpy/linalg/lapack_litemodule.o build/temp.macosx-10.10-intel-2.7/numpy/linalg/lapack_lite/python_xerbla.o -L/opt/local/lib -L/usr/local/Cellar/gcc/4.9.1/lib/gcc/x86_64-apple-darwin14.0.0/4.9.1 -Lbuild/temp.macosx-10.10-intel-2.7 -llapack -lptf77blas -lptcblas -latlas -lgfortran -o build/lib.macosx-10.10-intel-2.7/numpy/linalg/lapack_lite.so
  
  ld: symbol dyld_stub_binding_helper not found, normally in crt1.o/dylib1.o/bundle1.o for architecture x86_64
  
  collect2: error: ld returned 1 exit status
  
  ld: symbol dyld_stub_binding_helper not found, normally in crt1.o/dylib1.o/bundle1.o for architecture x86_64
  
  collect2: error: ld returned 1 exit status
  
  error: Command "/usr/local/bin/gfortran -Wall -g -arch x86_64 -Wall -g -undefined dynamic_lookup -bundle build/temp.macosx-10.10-intel-2.7/numpy/linalg/lapack_litemodule.o build/temp.macosx-10.10-intel-2.7/numpy/linalg/lapack_lite/python_xerbla.o -L/opt/local/lib -L/usr/local/Cellar/gcc/4.9.1/lib/gcc/x86_64-apple-darwin14.0.0/4.9.1 -Lbuild/temp.macosx-10.10-intel-2.7 -llapack -lptf77blas -lptcblas -latlas -lgfortran -o build/lib.macosx-10.10-intel-2.7/numpy/linalg/lapack_lite.so" failed with exit status 1
  
  ----------------------------------------
  Cleaning up...
  Command /Users/admin/.virtualenvs/numpy_env/bin/python -c "import setuptools, tokenize;__file__='/Users/admin/.virtualenvs/numpy_env/build/numpy/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/5b/1l8zg39d48d865bktn00qnbr0000gn/T/pip-yQOlkU-record/install-record.txt --single-version-externally-managed --compile --install-headers /Users/admin/.virtualenvs/numpy_env/include/site/python2.7 failed with error code 1 in /Users/admin/.virtualenvs/numpy_env/build/numpy
  Storing debug log for failure in /var/folders/5b/1l8zg39d48d865bktn00qnbr0000gn/T/tmpuDgjp9
  </code></pre>
  
  <p>I have tried upgrading Python, recreating my virtualenv, restarting my system, and banging my head on the desk, but none have helped. I also ran <code>brew rm gfortran</code> followed by <code>brew install gcc</code>, but that didn't help.</p>