anchor.diff:      "--enable-rpath"
       "--enable-schemas-compile"
       "--disable-gtk2"
  -    (enFlag "vala" (vala != null) null)
  +    "--${boolEn (vala != null)}-vala"
     ];
   
     CFLAGS = "-Wno-deprecated-declarations";
  
positive.code: 
  let
    inherit (stdenv.lib)
      enFlag;
  in
  
  stdenv.mkDerivation rec {
    name = "colord-gtk-0.1.26";
  
    src = fetchurl rec {
      url = "https://www.freedesktop.org/software/colord/releases/${name}.tar.xz";
      sha1Url = "${url}.sha1";
      sha256 = "28d00b7f157ea3e2ea5315387b2660fde82faba16674861c50465e55d61a3e45";
      hashOutput = false;
    };
  
negative.code:   ];
  
    configureFlags = [
      "--${boolEn (gobject-introspection != null)}-introspection"
      "--disable-gtk-doc"
      "--disable-gtk-doc-html"
      "--disable-gtk-doc-pdf"
  