1diff --git a/src/include/lwipopts.h b/src/include/lwipopts.h 2index 5ba123f..baf739e 100644 3--- a/src/include/lwipopts.h 4+++ b/src/include/lwipopts.h 5@@ -244,9 +244,13 @@ 6 7 #define SO_REUSE 1 8 9+#ifndef FIONBIO 10 #define FIONBIO 0x5421 /* same as define in asm-generic/ioctls.h */ 11+#endif 12 13+#ifndef O_NONBLOCK 14 #define O_NONBLOCK 04000 /* same as define in bits/fcntl-linux.h */ 15+#endif 16 17 #define SIOCSHIWAT 1 18 19