diff --git a/Makefile.d/endian_test.h b/Makefile.d/endian_test.h
new file mode 100644
index 0000000..e600e14
--- /dev/null
+++ b/Makefile.d/endian_test.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2011 Carl-Daniel Hailfinger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * This file determines the target endian. It should only be used by the Makefile
+ */
+
+/*
+ * This works since gcc 4.6 and with clang
+ * https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
+ */
+#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+"big"
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+"little"
+#else
+"unknown"
+#endif