# only one of the following can be true
# test should be removed if MM_Unix ever stops handling other OS than Unix
my $os = ($ExtUtils::MM_Unix::Is_OS2 || 0)
- + ($ExtUtils::MM_Unix::Is_Mac || 0)
+ ($ExtUtils::MM_Unix::Is_Win32 || 0)
+ ($ExtUtils::MM_Unix::Is_Dos || 0)
+ ($ExtUtils::MM_Unix::Is_VMS || 0);