anchor.diff: -{ fetchFromGitHub, silver-searcher, tree, man, stdenv,
  +{ fetchFromGitHub, ag, tree, man, stdenv, 
     pandocSupport ? true, pandoc ? null
     , ... }:
   
  
positive.code:     else
        "#pandoc_cmd=pandoc";
    in ''
      mkdir -p $out/{bin,share/man/man1,share/bash-completion/completions}
      substituteInPlace memo \
        --replace "ack_cmd=ack"       "ack_cmd=${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
      mv completion/memo.bash $out/share/bash-completion/completions/memo.sh
    '';
  
    meta = {
  
negative.code: 
    name = "memo-${version}";
  
    version = "0.5";
  
    src = fetchFromGitHub {
      owner  = "mrVanDalo";
      repo   = "memo";
      rev    = "${version}";
      sha256 = "1kq8hmq4lgvkk717nhmdryr90g61xm0jm7y8dzya8jsxsn531gm8";
    };
  
    installPhase = let
  