anchor.diff:    patches = [
       # Bring .pc file in line with our patched pkg-config.
       ./0001-pkg-config-Declare-header-dependencies-as-public.patch
  +  ];
  +
  +  depsBuildBuild = [
  +    pkg-config
     ];
   
     nativeBuildInputs = [
  
positive.code:   pname = "gupnp";
    version = "1.4.0";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/gupnp/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
  
negative.code:   ];
  
    mesonFlags = [
      "-Dgtk_doc=${lib.boolToString (stdenv.buildPlatform == stdenv.hostPlatform)}"
      "-Dintrospection=${lib.boolToString (stdenv.buildPlatform == stdenv.hostPlatform)}"
    ];
  
    doCheck = true;
  