anchor.diff:        ln -sv avahi-compat-howl.pc $out/lib/pkgconfig/howl.pc
       '';
   
  -  meta = with stdenv.lib; {
  +  meta = with lib; {
       description = "Facilitates service discovery on a local network";
       homepage = http://avahi.org;
       license = licenses.lgpl2Plus;
  
positive.code: { stdenv
  , fetchurl
  , autoconf
  , automake
  , libtool
  , gettext
  , xmltoman
  
negative.code:     "--enable-compat-libdns_sd"
      "--enable-compat-howl"
      "--with-distro=none"
      "--${boolWt (expat != null)}-xml"
      #"--with-avahi-group=<user>"
      #"--with-avahi-group=<group>"
      #"--with-autoipd-user=<user>"
  