Error installing Python Image Library using pip on Mac OS X 10.9

I want to install PIL on Mavericks using pip but get this error.

    _imagingft.c:73:10: fatal error: 'freetype/fterrors.h' file not found
    #include <freetype/fterrors.h>
    1 error generated.
    error: command 'cc' failed with exit status 1

My Command Line Tools are installed and up to date and every hint I found didn't help. How can I get this to compile?

EDIT: I just checked, freetype is also already installed via homebrew

Instead of symlinking to a specific version of freetype2, do this:

    ln -s /usr/local/include/freetype2 /usr/local/include/freetype

This saves you the trouble of recreating the symlink whenever you upgrade freetype2.