anchor.diff:  
   stdenv.mkDerivation rec {
     name = "gtk+-${version}";
  -  versionMajor = "3.18";
  -  versionMinor = "9";
  +  versionMajor = "3.20";
  +  versionMinor = "0";
     version = "${versionMajor}.${versionMinor}";
   
     src = fetchurl {
       url = "mirror://gnome/sources/gtk+/${versionMajor}/${name}.tar.xz";
  -    sha256 = "783d7f8b00f9b4224cc94d7da885a67598e711c2d6d79c9c873c6b203e83acbd";
  +    sha256 = "1c3d3a4a6e959ec8636ccb074bcdb8fa25c81ec56fbc70de6a3f5ef83ba6d803";
     };
   
     nativeBuildInputs = [
  
positive.code:   ];
  
    configureFlags = [
      (enFlag "xkb" (libxkbcommon != null) null)
      (enFlag "xinerama" (xorg != null) null)
      (enFlag "xrandr" (xorg != null) null)
      (enFlag "xfixes" (xorg != null) null)
      (enFlag "xcomposite" (xorg != null) null)
      (enFlag "xdamage" (xorg != null) null)
      (enFlag "x11-backend" (true) null) # xorg deps
      "--disable-win32-backend"
      "--disable-quartz-backend"
      (enFlag "broadway-backend" true null)
  
negative.code:       codyopel
      ];
      platforms = with platforms;
        x86_64-linux;
    };
  }
  