The following forum message was posted by alexmazzei at http://sourceforge.net/projects/clisp/forums/forum/3816/topic/5329564:
after several and several attempts to build libffi on Mac OS X (10.6.8), I
found a dmg that seems to work (!!) at
by using it I have been able to build (with port) CLISP with FFI :)
Hope it can be useful.