use Compress::Zlib qw/gzopen gzeof gzread gzclose gzerror/;
unshift @INC, sub {
    my ($cref, $filename) = @_;
    $filename = "/path/to/compressed/libs/${filename}.gz";
    return unless -f $filename;
    my $text;
    {
        my $gz = gzopen( $filename, 'rb')
            or warn $gz->gzerror() and return;
        while ( !$gz->gzeof() ) {
            my $buffer;
            my $bytes = $gz->gzread($buffer);
            warn $gz->gzerror() and return
                if $bytes == -1;
            $text .= $buffer;
        }
        $gz->gzclose();
    }
    require 5.008;
    open my $fh, '<', \$text or return;
    $fh;
}