anchor.diff:      else
         with builtins; filterSource
           (path: _:
  -           !elem (baseNameOf path) [".git" "result" "bin" "_build_ci"]) ./.;
  +           !elem (baseNameOf path) [".git" "result" "bin" "_build" "_build_ci"]) ./.;
   
     prefixKey = "-prefix ";
   
  
positive.code:   buildInputs = [
      hostname
      python2 time # coq-makefile timing tools
    ]
    ++ (with ocamlPackages; [ ocaml findlib camlp5_strict num ])
    ++ optional buildIde ocamlPackages.lablgtk
  
negative.code: 
  { pkgs ?
      (import (fetchTarball {
        url = "https://github.com/NixOS/nixpkgs/archive/4477cf04b6779a537cdb5f0bd3dd30e75aeb4a3b.tar.gz";
        sha256 = "1i39wsfwkvj9yryj8di3jibpdg3b3j86ych7s9rb6z79k08yaaxc";
      }) {})
  , ocamlPackages ? pkgs.ocaml-ng.ocamlPackages_4_06
  , buildIde ? true
  