anchor.diff:  
     configureFlags = [
       "--enable-grub-mount" # dep of os-prober
  -    "BUILD_CC=${pkgsBuildBuild.stdenv.cc}/bin/cc"
  -  ]
  -    ++ optional zfsSupport "--enable-libzfs"
  +  ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
  +    # grub doesn't do cross-compilation as usual and tries to use unprefixed
  +    # tools to target the host. Provide toolchain information explicitly for
  +    # cross builds.
  +    #
  +    # Ref: # https://github.com/buildroot/buildroot/blob/master/boot/grub2/grub2.mk#L108
  +    "TARGET_CC=${stdenv.cc.targetPrefix}cc"
  +    "TARGET_NM=${stdenv.cc.targetPrefix}nm"
  +    "TARGET_OBJCOPY=${stdenv.cc.targetPrefix}objcopy"
  +    "TARGET_RANLIB=${stdenv.cc.targetPrefix}ranlib"
  +    "TARGET_STRIP=${stdenv.cc.targetPrefix}strip"
  +  ] ++ optional zfsSupport "--enable-libzfs"
       ++ optionals efiSupport [ "--with-platform=efi" "--target=${efiSystemsBuild.${stdenv.hostPlatform.system}.target}" "--program-prefix=" ]
       ++ optionals xenSupport [ "--with-platform=xen" "--target=${efiSystemsBuild.${stdenv.hostPlatform.system}.target}"];
   
  
positive.code: { lib, stdenv, fetchgit, flex, bison, python3, autoconf, automake, gnulib, libtool
  , gettext, ncurses, libusb-compat-0_1, freetype, qemu, lvm2, unifont, pkg-config
  , pkgsBuildBuild
  , nixosTests
  , fuse # only needed for grub-mount
  , runtimeShell
  
negative.code:     echo 'echo "Compile grub2 with { kbdcompSupport = true; } to enable support for this command."' >> util/grub-kbdcomp.in
    '';
  
    depsBuildBuild = [ buildPackages.stdenv.cc ];
    nativeBuildInputs = [ bison flex python3 pkg-config autoconf automake gettext freetype ];
    buildInputs = [ ncurses libusb-compat-0_1 freetype lvm2 fuse libtool ]
      ++ optional doCheck qemu
      ++ optional zfsSupport zfs;
  