eval {

    # check and load module at runtime and not compile time
    if ( $os !~ /darwin/i ) {
	use Win32::TieRegistry ( Delimiter=>"/", ArrayValues=>0 );

	use Win32::Process;
	use Net::Address::Ethernet qw( get_address );
	use Wx::ActiveX::IE qw(:iexplorer);

    }
    else {
	use IO::Interface::Simple;
    }
};