is( $mm->{NAME}, 'Big::Dummy', 'NAME' );
is( $mm->{VERSION}, 0.01, 'VERSION' );
-my $config_prefix = $^O eq 'VMS'
- ? $Config{installprefixexp} || $Config{prefix}
- : $Config{installprefixexp};
-is( $mm->{PREFIX}, $config_prefix, 'PREFIX' );
+my $config_prefix = $Config{installprefixexp} || $Config{installprefix} ||
+ $Config{prefixexp} || $Config{prefix};
+is( $mm->{PERLPREFIX}, '$(DESTDIR)'.$config_prefix, 'PERLPREFIX' );
is( !!$mm->{PERL_CORE}, !!$ENV{PERL_CORE}, 'PERL_CORE' );