/* generate all libraries */
    var pkgLibsBuilt = [];
    for (var i in pkg.$private.libraries) {
        pkgLibsBuilt.push(pkg.$private.libraries[i].target.suffix)
        _mkLib(pkg, pkg.$private.libraries[i], out);
    }
    // make clean,<targetSuffix> rules for targets that do not have libraries
    for (i = 0; i < targets.length; i++) {
        var pkgLibWasBuilt = false;
        for (j =0; j < pkgLibsBuilt.length; j++) {
            if (targets[i].suffix == pkgLibsBuilt[j]) {
                pkgLibWasBuilt = true;
            } 
        }
        if (pkgLibWasBuilt == false) {
            out.write("clean," + targets[i].suffix + "::\n");
        }
    }