anchor.diff:  , vala
   }:
   
  +# FIXME: add makeWrapper for graphical utility.
  +
   let
  -  major = "1.0";
  -  version = "${major}.2";
  +  channel = "1.0";
  +  version = "${channel}.3";
   in
   stdenv.mkDerivation rec {
     name = "gssdp-${version}";
   
     src = fetchurl {
  -    url = "mirror://gnome/sources/gssdp/${major}/${name}.tar.xz";
  +    url = "mirror://gnome/sources/gssdp/${channel}/${name}.tar.xz";
       hashOutput = false;
  -    sha256 = "a1e17c09c7e1a185b0bd84fd6ff3794045a3cd729b707c23e422ff66471535dc";
  +    sha256 = "211387a62bc1d99821dd0333d873a781320287f5436f91e58b2ca145b378be41";
     };
   
     nativeBuildInputs = [
  +    meson
  +    ninja
       vala
     ];
   
  
positive.code: { stdenv
  , fetchurl
  
  , glib
  , gobject-introspection
  
negative.code:     libsoup
    ];
  
    mesonFlags = [
      "-Dexamples=false"
    ];
  
    setVapidirInstallFlag = false;
  
    passthru = {
      srcVerification = fetchurl {
  