Linking of the test library and utilities fails on OSX because they use indirectly linked
symbols. On OSX you need to link both fontconfig and freetype, even if fontconfig is
already linked with freetype, and you need to link both cairo and fontconfig into the testlib
if you want to use symbols from fontconfig.

Another issue is that configure disables freetype if you specify FONTCONFIG_LIBS etc.
but not FREETYPE_LIBS etc.

Btw:
On OSX one needs to have exact control over this, since Tiger still ships with freetype 2.1.1
and fontconfig 1.0.1 (in /usr/X11R6). If the X11 includes come before the freetype/fontconfig 
ones, the configuration will fail.