+/* These macros are already defined as part of newlib's sys/cdefs.h.
+ * However they are not part of standard libc which is used to compile
+ * the host tools. For now, simply add them here.
+ */
+#define __packed __attribute__((packed))
+#define __unused __attribute__((unused))
+#define __aligned(x) __attribute__((aligned(x)))
+