anchor.diff: -{ lib, stdenv, fetchurl, cmake, recode, perl }:
  +{ lib, stdenv, fetchurl, cmake, recode, perl, withOffensive ? false }:
   
   stdenv.mkDerivation rec {
     pname = "fortune-mod";
  
positive.code: 
    cmakeFlags = [
      "-DLOCALDIR=${placeholder "out"}/share/fortunes"
      "-DNO_OFFENSIVE=true"
    ];
  
    patches = [ (builtins.toFile "not-a-game.patch" ''
      diff --git a/CMakeLists.txt b/CMakeLists.txt
  
negative.code:     --
    '') ];
  
    postFixup = lib.optionalString (!withOffensive) ''
      rm -f $out/share/fortunes/men-women*
    '';
  
  