/* This is a private header, never even think of including this directly! */
+#if __INCLUDE_LEVEL__ <= 1
+#error "Do not include _sd-common.h directly, it is a private header."
+#endif
+
#ifndef _sd_printf_
# if __GNUC__ >= 4
# define _sd_printf_(a,b) __attribute__ ((format (printf, a, b)))