anchor.diff: -{ lib, stdenv, fetchzip }:
  +{ lib, stdenv, fetchzip, buildEnv, roundcube, roundcubePlugins }:
   let
     version = "1.3.8";
   in
  
positive.code:     rm -rf $out/installer
    '';
  
    meta = {
      description = "Open Source Webmail Software";
      maintainers = with stdenv.lib.maintainers; [ vskilet ];
  
negative.code:     platforms = stdenv.lib.platforms.all;
    };
  }
  