Unfortunately, freetype2 does not come with OS X by default. Here are some notes on how to compile from source. It assumes that you have Xcode installed. Please keep installation path as: /usr/local
1) Download and extract
cd some-place-with-source-files
curl -O http://sourceforge.net/projects/freetype/files/freetype2/2.5.5/freetype-2.5.5.tar.gz
tar xfz freetype-2.5.5.tar.gz
2) Configure and Install
cd freetype-2.5.5
./configure --prefix=/usr/local
make
sudo make install