*** ./src/bwping.c.ORIG	Mon Jul 15 19:14:16 2019
--- ./src/bwping.c	Mon Jul 15 19:15:02 2019
***************
*** 160,165 ****
--- 160,169 ----
      (*transmitted_number)++;
  }
  
+ #ifndef MSG_DONTWAIT
+ #define MSG_DONTWAIT MSG_NONBLOCK
+ #endif
+ 
  static bool recv_ping(int sock, uint16_t ident, uint32_t *received_number, uint64_t *received_volume)
  {
      size_t             hlen;
*** ./src/bwping6.c.ORIG	Mon Jul 15 19:14:20 2019
--- ./src/bwping6.c	Mon Jul 15 19:15:34 2019
***************
*** 132,137 ****
--- 132,141 ----
      (*transmitted_number)++;
  }
  
+ #ifndef MSG_DONTWAIT
+ #define MSG_DONTWAIT MSG_NONBLOCK
+ #endif
+ 
  static bool recv_ping(int sock, uint16_t ident, uint32_t *received_number, uint64_t *received_volume)
  {
      ssize_t             res;