self: super: { prosody = super.prosody.overrideAttrs (oldAttrs: { communityModules = super.fetchhg { url = "https://hg.prosody.im/prosody-modules"; rev = "2dcbc01c9931"; sha256 = "0ydhbvfp7vk5zqpsc54ihxz6y2gmzh0bcgyz0xidlxrmxzwcvvyh"; }; }); }