holds one of the following values:
@itemize @bullet
-@item @b{winxx} Built using Microsoft Visual Studio
-@item @b{linux} Linux is the underlying operating sytem
-@item @b{darwin} Darwin (mac-os) is the underlying operating sytem.
@item @b{cygwin} Running under Cygwin
+@item @b{darwin} Darwin (Mac-OS) is the underlying operating sytem.
+@item @b{freebsd} Running under FreeBSD
+@item @b{linux} Linux is the underlying operating sytem
@item @b{mingw32} Running under MingW32
+@item @b{winxx} Built using Microsoft Visual Studio
@item @b{other} Unknown, none of the above.
@end itemize