anchor.diff: -{ lib, stdenv, fetchurl, fetchpatch, pkgconfig, libtool
  +{ lib, stdenv, fetchFromGitHub, fetchpatch, pkgconfig, libtool
   , bzip2, zlib, libX11, libXext, libXt, fontconfig, freetype, ghostscript, libjpeg
   , lcms2, openexr, libpng, librsvg, libtiff, libxml2, openjpeg, libwebp
   , ApplicationServices
  
positive.code: 
    cfg = {
      version = "7.0.7-22";
      sha256 = "12c48cfhc2a3zvhgxdywrfy8b4m2vx85vn2qj69iyni5x849xpj9";
      patches = [];
    };
  in
  
negative.code:   name = "imagemagick-${version}";
    inherit (cfg) version;
  
    src = fetchFromGitHub {
      owner = "ImageMagick";
      repo = "ImageMagick";
      rev = cfg.version;
      inherit (cfg) sha256;
    };
  
  