Index: include/mruby.h
--- include/mruby.h.orig
+++ include/mruby.h
@@ -38,6 +38,7 @@
 #define __STDC_FORMAT_MACROS
 #endif
 
+#include <endian.h>
 #include <stdarg.h>
 #include <stdint.h>
 #include <stddef.h>