anchor.diff:  
     xwayland = callPackage ../servers/x11/xorg/xwayland.nix { };
   
  -  yaws = callPackage ../servers/http/yaws { };
  +  yaws = callPackage ../servers/http/yaws {
  +    erlang = erlangR18;
  +  };
   
     zabbix = recurseIntoAttrs (callPackages ../servers/monitoring/zabbix {});
   
  
positive.code: 
    winswitch = callPackage ../tools/X11/winswitch { };
  
    wings = callPackage ../applications/graphics/wings { };
  
    wireguard = callPackage ../os-specific/linux/wireguard { };
  
  
negative.code:   inherit (beam.packages.erlang)
      rebar rebar3-open rebar3
      hexRegistrySnapshot fetchHex beamPackages
      hex2nix cuter;
  
    inherit (beam.packages.erlangR18) relxExe;
  
    groovy = callPackage ../development/interpreters/groovy { };
  
  