I just tried compiling a CVS version of 21.5.1 on Mac OS X with X11
Config is ok, but when it compiles glyphs-x, gcc -O3 seems to hang. (I let
it run for some 40 minutes). I stopped compilation and maually
compiled that file with -O instead. This compiled quickly.
The result works in tty mode. Haven't had a chance to try the X11