(I believe darwin is "unix enough" to fit within Unix.pm),
I hear Schwern thinks so :)
Unix.pm use to be more polluted than it is now, so I think
File::Spec needs darwin entry to point to File::Spec::Mac
my %module = (
darwin => 'Mac',
MacOS => 'Mac',
MSWin32 => 'Win32',
os2 => 'OS2',
VMS => 'VMS',
epoc => 'Epoc',
NetWare => 'Win32', # Yes, File::Spec::Win32 works on NetWar
+e.
symbian => 'Win32', # Yes, File::Spec::Win32 works on symbia
+n.
dos => 'OS2', # Yes, File::Spec::OS2 works on DJGPP.
cygwin => 'Cygwin');