anchor.diff:  { fetchFromGitHub, silver-searcher, tree, man, stdenv,
  +  git,
     pandocSupport ? true, pandoc ? null
     , ... }:
   
  
positive.code:       --replace "ack_cmd=ack"       "ack_cmd=${silver-searcher}/bin/ag" \
        --replace "tree_cmd=tree"     "tree_cmd=${tree}/bin/tree" \
        --replace "man_cmd=man"       "man_cmd=${man}/bin/man" \
        --replace "pandoc_cmd=pandoc" "${pandocReplacement}"
      mv memo $out/bin/
      mv doc/memo.1 $out/share/man/man1/memo.1
  
negative.code: 
    name = "memo-${version}";
  
    version = "0.6";
  
    src = fetchFromGitHub {
      owner  = "mrVanDalo";
      repo   = "memo";
      rev    = "${version}";
      sha256 = "1cvjs36f6vxzfz5d63yhyw8j7gdw5hn6cfzccf7ag08lamjhfhbr";
    };
  
    installPhase = let
  