self: super: {
  prosody = super.prosody.overrideAttrs (oldAttrs:  {
    communityModules = super.fetchhg {
      url = "https://hg.prosody.im/prosody-modules";
      rev = "268fa9d45840";
      sha256 = "1a5ihbg5b0bsw224hdj4fxwy0j98yjzbijz85gd34x923dh3vvkl";
    };
  });
}