sio.h: include opt.h for checking #ifndef's

10 years ago · b7da649944
1 changed files with 1 additions and 0 deletions
--- a/src/include/lwip/sio.h
+++ b/src/include/lwip/sio.h
@ -36,6 +36,7 @@
 #define SIO_H

 #include "lwip/arch.h"
+#include "lwip/opt.h"

 #ifdef __cplusplus
 extern "C" {