I once somehow had managed to build a version of ft2demos tools which worked with the OS X X11 (XQuartz) server.
But now, with the standard "autogen.sh then make" of current git FreeType plus the "make" of current git ft2demos, the tools build but when trying to use them, I get:
ftmulti 72 CinzelGX.ttf
cannot open X11 display
could not allocate display surface
error = 0x0000
Perhaps this is because in the recent versions of Mac OS X, X11 is not included by default but the optional XQuartz installer (
http://www.xquartz.org/ ) installs X11 into:
/opt/X11
Maybe this could be automatically recognized by FT?
A.