Building ‘_imagingft’ extension error command ‘cc’ failed with exit status 1

This error is due to freetype header missing.

_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

 First, verify freetype is installed. With brew:

brew install freetype

If freetype installed, warning message shows:

Warning: freetype-2.5.5 already installed

Next to fixed the issue, is create a symlink for freetype2.
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.

By Keenlio, November 3, 2015