qmake goes into a recursive loop if /usr/lib/.libs is present

                    QString lib = opt.right(opt.length() - 2);
                    QString prl_ext = project->first(ProKey("QMAKE_" + lib.toUpper() + "_SUFFIX")).toQString();
                    for(int dep_i = 0; dep_i < libdirs.size(); ++dep_i) {
                        const QMakeLocalFileName &lfn = libdirs[dep_i];
                        if(!project->isActiveConfig("compile_libtool")) { //give them the .libs..
                            QString la = lfn.local() + '/' + project->first("QMAKE_PREFIX_SHLIB") + lib + Option::libtool_ext;
                            if (exists(la) && QFile::exists(lfn.local() + "/.libs")) {
                                QString dot_libs = lfn.real() + Option::dir_sep + ".libs";
                                l.append("-L" + dot_libs);
                                libdirs.insert(libidx++, QMakeLocalFileName(dot_libs));
                            }
                        }