void clean(int dist)
{
    run("rm -rf "
            "build-stamp configure-stamp "
            "options/SKEL "
            "tmp/*.o tmp/*-stamp " + 
            "o */o release.yo tmp/lib*.a "    
    );

    if (dist)
        run("rm -rf tmp *.ih.gch */*.ih.gch");

    exit(0);
}




