Sorry for bringing this thread from ashes.
I also found this same problem after moving from Mac OSX 10.6 to 10.8.
I installed the latest XQuartz and Xcode. But, I did not want to install Fink or MacPorts as I did in 10.6, which messed up my system.
I can work around with this issue by linking libfontconfig.1.dylib and libfreetype.6.dylib to the one from XQuartz or Xcode.
For example, in abin
ln -s /opt/X11/lib/libfontconfig.1.dylib libfontconfig.1.dylib
ln -s /opt/X11/lib/libfreetype.6.dylib libfreetype.6.dylib
I believed using XQuartz's libraries is more convenient than using the one supplied by AFNI since they were linked to Fink's libraries. In 10.8, people will need to install XQuartz anyway to use the GUI of AFNI.