anchor.diff:      substituteInPlace Makefile \
         --replace '$(shell echo `pwd`/rebar)' ${rebar}/bin/rebar \
         --replace "/usr/local" $out
  +  '';
  +
  +  postFixup = ''
  +    # Elixirs binaries are shell scripts which run erl. This adds some
  +    # stuff to PATH so the scripts run without problems.
  +
  +    for f in $out/bin/*
  +    do
  +      wrapProgram $f \
  +      --prefix PATH ":" "${erlang}/bin:${coreutils}/bin"
  +    done
     '';
   
     meta = {
  
positive.code: { stdenv, fetchurl, erlang, rebar }:
  
  stdenv.mkDerivation {
    name = "elixir-0.10.1";
  
negative.code:     sha256 = "0gfr2bz3mw7ag9z2wb2g22n2vlyrp8dwy78fj9zi52kzl5w3vc3w";
    };
  
    buildInputs = [ erlang rebar makeWrapper ];
  
    preBuild = ''
      substituteInPlace rebar \
  