debian/watch

   1 version=3
   2 opts=uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha|b|a)[\-\.]?\d*)$/$1~$2/ \
   3     http://download.savannah.gnu.org/releases/quagga/quagga-(\d.*)\.(?:tgz|tar\.(?:gz|bz2|xz))