I got an error that ftheader.h could not be found, but when I ran the following command and then installed it again, it succeeded.
sudo ln -s /usr/X11/include/freetype2/freetype /usr/X11/include/
Reference: [NumPy Matplotlib install error: ftheader.h: No such file or directory --Stack Overflow](http://stackoverflow.com/questions/19697457/numpy-matplotlib-install-error-ftheader-h-no-such- file-or-directory)