All modifications are behind compileflag INTERNATIONAL, and affect these two directories; source/blender/src and source/blender/ftfont. Thanks to philipp, a new utf8towchar() function is added to Shizu's work, which fixes the international support for OSX. It also makes the iconv library obsolete. This means all translation files (blender.mo) need to be 'recoded' to UTF-8, and language support in the fileselect window and the text editor is not possible. Iconv might be added in the future to enable these features.