anchor.diff:  { lib, stdenv, pkg-config, pango, perl, python3, zip
   , libjpeg, zlib, dbus, dbus-glib, bzip2, xorg
   , freetype, fontconfig, file, nspr, nss
  -, yasm, libGLU, libGL, sqlite, unzip, makeWrapper
  +, libGLU, libGL, sqlite, unzip, makeWrapper
   , hunspell, libevent, libstartup_notification
   , libvpx
  -, icu70, libpng, glib, pciutils
  -, autoconf213, which, gnused, rustPackages, rustPlatform
  +, icu, libpng, glib, pciutils
  +, autoconf, which, gnused, rustPackages, rustPlatform
   , rust-cbindgen, nodejs, nasm, fetchpatch
   , gnum4
   , gtk3, wrapGAppsHook
  
positive.code: 
    nativeBuildInputs =
      [
        autoconf213
        cargo
        gnused
        llvmPackages.llvm # llvm-objdump
  
negative.code:     rm -f configure
      rm -f js/src/configure
      rm -f .mozconfig*
      # this will run autoconf
      configureScript="$(realpath ./mach) configure"
      export MOZBUILD_STATE_PATH=$(pwd)/mozbuild
  
  