$a = join ',', sort split /,/, $a;
$a =~ s/-uWin32,// if $^O eq 'MSWin32';
$a =~ s/-u(Cwd|File|File::Copy|OS2),//g if $^O eq 'os2';
+$a =~ s/-uCwd,// if $^O eq 'cygwin';
if ($Config{static_ext} eq ' ') {
$b = '-uCarp,-uCarp::Heavy,-uDB,-uExporter,-uExporter::Heavy,-uattributes,'
. '-umain,-uwarnings';