I want to install matplotlib via pip. There is a problem with freetype2.h REQUIRED DEPENDENCIES numpy: 1.6.2 freetype2: found, but unknown version (no pkg-config) * WARNING: Could not find 'freetype2' headers in any * of '.', './freetype2'. Somebody had a similar problem ( How to install matplotlib on OS X?), and it was suggested to install pkg-config first. I did that with macports, but I still get the same warning. I used find to look for the headers, and they are definitely present in: /opt/X11/include/ft2build.h /usr/X11/include/ft2build.h How can I use those files to install matplotlib?