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
wget  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