What versions of Unix does XEmacs run on?
XEmacs is regularly tested on Linux, Solaris, SunOS, HP/UX, FreeBSD, OpenBSD, BSD/OS aka BSDI, Tru64 aka DEC/OSF, SCO5, and probably others. It should work on all versions of Unix created in the last 10 years or so, perhaps with a bit of work on more obscure platforms to correct bit-rot. It uses a sophisticated configuration system to auto-detect zillions of features that are implemented differently in different versions of Unix, so it will probably work on your vendor’s version, possibly with a bit of tweaking, even if we’ve never heard of it. For problems with particular machines and versions of Unix, see the `PROBLEMS’ file. Much effort has gone into making XEmacs work on as many different machines, configurations, and compilers as possible. Much effort has gone into making XEmacs 64-bit clean. Much effort has gone into removing system-specific code, and replacing such code with autodetection at configure time. The XEmacs core should build “out of the box” on most Unix-like systems.