anchor.diff:      sha256 = "0gfr2bz3mw7ag9z2wb2g22n2vlyrp8dwy78fj9zi52kzl5w3vc3w";
     };
   
  -  buildInputs = [ erlang rebar ];
  +  buildInputs = [ erlang rebar makeWrapper ];
   
     preBuild = ''
       substituteInPlace rebar \
  
positive.code:     substituteInPlace Makefile \
        --replace '$(shell echo `pwd`/rebar)' ${rebar}/bin/rebar \
        --replace "/usr/local" $out
    '';
  
    meta = {
  
negative.code: { stdenv, fetchurl, erlang, rebar, makeWrapper, coreutils }:
  
  stdenv.mkDerivation {
    name = "elixir-0.10.1";
  