anchor.diff:    pkgconfig, libXcomposite, libXdamage, libXext, libXfixes, libXinerama,
     libXrandr, libXrender, xwininfo }:
   
  -stdenv.mkDerivation {
  -  name = "compton-git-2016-08-10";
  +stdenv.mkDerivation rec {
  +  name = "compton-git-${version}";
  +  version = "2018-05-21";
   
     src = fetchFromGitHub {
  -    owner  = "chjj";
  +    owner  = "yshui";
       repo   = "compton";
  -    rev    = "f1cd308cde0f1e1f21ec2ac8f16a3c873fa22d3a";
  -    sha256 = "1ky438d1rsg4ylkcp60m82r0jck8rks3gfa869rc63k37p2nfn8p";
  +    rev    = "9b24550814b7c69065f90039b0a5d0a2281b9f81";
  +    sha256 = "09nn0q9lgv59chfxljips0n8vnwwxi1yz6hmcsiggsl3zvpabpxl";
     };
   
     nativeBuildInputs = [
  
positive.code:       additional features, such as additional effects, and a fork at a
        well-defined and proper place.
      '';
      maintainers = [ maintainers.ertes ];
      platforms = platforms.linux;
    };
  }
  
negative.code:   meta = with stdenv.lib; {
      description =
        "A fork of XCompMgr, a sample compositing manager for X servers (git version)";
      homepage = https://github.com/yshui/compton/;
      license = licenses.mit;
      longDescription = ''
        A fork of XCompMgr, which is a sample compositing manager for X
  