Libtool's version for FreeType 2.1.3 is `9.2.3'.

On most platforms, the soname will be `6.3.2' (e.g. `libfreetype.so.6.3.2').

Libtool's version for FreeType 2.1.2 is `9.1.3'.

On most platforms, the soname will be `6.3.1' (e.g. `libfreetype.so.6.3.1').