=item *
-A Unix system with GNU tools. GNU LilyPond is known to run on these
-unices: Linux, AIX, Digital Unix and Solaris.
+A GNU system: GNU LilyPond is known to run on these GNU systems:
+Linux, AIX, Digital Unix and Solaris.
If you have the Cygnus WINDOWS32 port of the GNU utils, it will even
work in Windows NT/95, but we don't promise to support it.