use ExtUtils::MakeMaker; my $core = grep { $_ eq 'PERL_CORE=1' } @ARGV; WriteMakefile( NAME => 'Safe', VERSION_FROM => 'Safe.pm', INSTALLDIRS => ($] < 5.011 ? 'perl' : 'site'), ($core || $] >= 5.011) ? () : (INST_LIB => '$(INST_ARCHLIB)'), );