anchor.diff:      sha256 = "1z8h6bjzmlscr6h6kdvzj8kspifb4n9dg7zi54z1cv2qi03kr8dk";
     };
   
  -  buildInputs = [ ocaml findlib ];
  +  buildInputs = [ which ocaml findlib ];
   
     # Version number in META file is wrong
     patchPhase = ''
  
positive.code: { stdenv, fetchFromGitHub, ocaml, findlib }:
  
  if !stdenv.lib.versionAtLeast ocaml.version "4.02"
  then throw "camlpdf is not available for OCaml ${ocaml.version}"
  
negative.code:     EOF
    '';
  
    preInstall = ''
      mkdir -p $out/lib/ocaml/${ocaml.version}/site-lib/stublibs
    '';
  
    meta = with stdenv.lib; {
      description = "An OCaml library for reading, writing and modifying PDF files";
  