anchor.diff:      "--without-sdl"
       "--${boolWt (libraw != null)}-libraw"
       "--${boolWt (jasper != null)}-jasper"
  -    "--without-graphviz"
  +    "--${boolWt (graphviz != null)}-graphviz"
       "--without-lua"
       "--${boolWt (ffmpeg != null)}-libavformat"
       "--${boolWt (v4l_lib != null)}-libv4l"
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        sha256Urls = map (n: "${n}/../SHA256SUMS") src.urls;
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  
  
negative.code: , cairo
  , exiv2
  , ffmpeg
  , graphviz
  , gdk-pixbuf
  , gexiv2
  , glib
  