build do
  Environment.new do |env|
    env["CC"] = "x86_64-w64-mingw32-gcc"
    env["CPPPATH"] += %w[/usr/include/efi /usr/include/efi/x86_64]
    env["CFLAGS"] += %w[-ffreestanding]
    env["LDFLAGS"] += %w[-nostdlib -Wl,-dll -shared -Wl,--subsystem,10 -e efi_main]
    env["LIBS"] += %w[gcc]
    env["sources"] = glob("*.c")
    env.Program("^/BOOTX64.EFI", "${sources}")
  end
end