bool foundRCS = !RCS::findFile(fn).empty();
bool foundCVS = foundRCS ? false : !CVS::findFile(fn).empty();
bool foundSVN = (foundRCS || foundCVS) ? false : SVN::findFile(fn);
bool foundRCS = !RCS::findFile(fn).empty();
bool foundCVS = foundRCS ? false : !CVS::findFile(fn).empty();
bool foundSVN = (foundRCS || foundCVS) ? false : SVN::findFile(fn);