Building GRUB with modules:
 - fat
 - iso9660
 - part_gpt
 - part_msdos
 - normal
 - boot
 - linux
 - configfile
 - loopback
 - chain
 - halt
 - efifwsetup
 - efi_gop
 - ls
 - search
 - search_label
 - search_fs_uuid
 - search_fs_file
 - echo
 - serial
 - gfxmenu
 - gfxterm
 - gfxterm_background
 - gfxterm_menu
 - test
 - loadenv
 - all_video
 - videoinfo
 - png
Adding additional modules:
cp: cannot stat '/nix/store/ghy6dia5c93if2z13fimnjppyx3bl4wk-grub-2.12/share/grub/unicode.pf2': No such file or directory