anchor.diff: -{ lib, stdenv, fetchFromGitHub,
  +{ lib, stdenv, fetchFromGitHub, fetchpatch,
     fetchHex, erlang, makeWrapper,
     writeScript, common-updater-scripts, coreutils, git, gnused, nix, rebar3-nix }:
   
  
positive.code:     };
  
      buildInputs = [ erlang ];
  
      postPatch = ''
        mkdir -p _checkouts _build/default/lib/
  
negative.code:         # global-deps.patch makes it possible to use REBAR_GLOBAL_PLUGINS to
          # instruct rebar3 to always load a certain plugin. It is necessary since
          # REBAR_GLOBAL_CONFIG_DIR doesn't seem to work for this.
          patches = old.patches ++ [ ./skip-plugins.patch ./global-plugins.patch ];
        }));
      in stdenv.mkDerivation {
        pname = "rebar3-with-plugins";
  