anchor.diff:    };
     parse_trans = fetchHex {
       pkg = "parse_trans";
  -    version = "3.3.0";
  -    sha256 = "17ef63abde837ad30680ea7f857dd9e7ced9476cdd7b0394432af4bfc241b960";
  +    version = "3.3.1";
  +    sha256 = "12w8ai6b5s6b4hnvkav7hwxd846zdd74r32f84nkcmjzi1vrbk87";
     };
  +
     providers = fetchHex {
       pkg = "providers";
       version = "1.8.1";
  -    sha256 = "e45745ade9c476a9a469ea0840e418ab19360dc44f01a233304e118a44486ba0";
  +    sha256 = "183b9128l4af60rs40agqh6kc6db33j4027ad6jajxn4x6nlamz4";
     };
  +
     relx = fetchHex {
       pkg = "relx";
  -    version = "4.1.0";
  -    sha256 = "b94a3f96697a479ee5217a853345e0f4977bdf40d3c040af0d3d80fadad82af4";
  +    version = "4.3.0";
  +    sha256 = "0h044arh41sr92r1nlg176shavlv7pvw17alwklhszgwlr4hk3kk";
     };
  +
     ssl_verify_fun = fetchHex {
       pkg = "ssl_verify_fun";
       version = "1.1.6";
  -    sha256 = "bdb0d2471f453c88ff3908e7686f86f9be327d065cc1ec16fa4540197ea04680";
  -  };
  -
  -  hex_core = fetchHex {
  -    pkg = "hex_core";
  -    version = "0.7.1";
  -    sha256 = "05c60411511b6dc79affcd99a93e67d71e1b9d6abcb28ba75cd4ebc8585b8d02";
  +    sha256 = "1026l1z1jh25z8bfrhaw0ryk5gprhrpnirq877zqhg253x3x5c5x";
     };
   in
   stdenv.mkDerivation rec {
  
positive.code:   tree }:
  
  let
    version = "3.14.2";
  
    # Dependencies should match the ones in:
    # https://github.com/erlang/rebar3/blob/${version}/rebar.lock
  
negative.code:     cp --no-preserve=mode -R ${providers} _checkouts/providers
      cp --no-preserve=mode -R ${relx} _checkouts/relx
      cp --no-preserve=mode -R ${ssl_verify_fun} _checkouts/ssl_verify_fun
  
      # Bootstrap script expects the dependencies in _build/default/lib
      # TODO: Make it accept checkouts?
  