anchor.diff:  { stdenv, lib, fetchgit, fetchFromGitHub
  -, gn, ninja, python, glib, pkg-config, icu
  +, gn, ninja, python, pythonPackages, glib, pkg-config, icu
   , xcbuild, darwin
   , fetchpatch
   }:
  
positive.code:   doCheck = true;
  
    patches = [
      ./darwin.patch
      ./gcc_arm.patch  # Fix building zlib with gcc on aarch64, from https://gist.github.com/Adenilson/d973b6fd96c7709d33ddf08cf1dcb149
    ];
  
negative.code:     "is_clang=${lib.boolToString stdenv.cc.isClang}"
      "use_sysroot=false"
      # "use_system_icu=true"
      "clang_use_chrome_plugins=false"
      "is_component_build=false"
      "v8_use_external_startup_data=false"
      "v8_monolithic=true"
  