sub MY::libscan {
    my( $mm, $path ) = @_;
    
## FIX SAUCE 
    if( $path =~ m{\$\(INST_LIB\)} ){
        warn "BEFORE $path\n";
        $path =~ s{.SAUCE.lib}{}; 
        warn "AFTER $path\n";
    }
    
## allow any directory (usually . is most important )
    return $path if -d $path;
    
## ignore perl4-style .pl files
    return $path if $path =~ /\.pm$/;
    return $path if $path =~ /^blib/;
    
    return ''; ## ignore by default
}
__END__
$ perl Makefile.PL INSTALL_BASE=thebase
Checking if your kit is complete...
Warning: the following files are missing in your kit:
        lib/Goner.pm
Please inform the author.
BEFORE $(INST_LIB)\SAUCE\lib\Goner.pm
AFTER $(INST_LIB)\Goner.pm
Generating a dmake-style Makefile
Writing Makefile for Goner
Writing MYMETA.yml and MYMETA.json

$ dmake install
cp SAUCE/lib/Goner.pm blib\lib\Goner.pm
Installing thebase\lib\perl5\Goner.pm
Appending installation info to thebase\lib\perl5\MSWin32-x86-multi-thread/perllocal.pod