I\'m having serious difficulty installing Scipy with pip on Mountain Lion. I\'ve tried:
sudo pip install -e git+https://github.com/scipy/scipy#egg=scipy-dev
Here is what worked for me for pip installing matplotlib and scipy inside a virtual environment (Mac OS X 10.9.2 Mavericks):
# See George's answer above
brew update
brew upgrade
brew install gfortran
# See http://www.scipy.org/scipylib/building/macosx.html (the link Nathan Gould posted above)
export CXX=g++-5.1
export CC=gcc-5.1
export FFLAGS=-ff2c
sudo ln -s /usr/bin/gcc /usr/bin/gcc-5.1
sudo ln -s /usr/bin/g++ /usr/bin/g++-5.1
pip install matplotlib
pip install scipy
matplot lib installed quickly, but scipy took a long time.