*** ./src/bwping.c.ORIG	Mon Jul 15 19:22:36 2019
--- ./src/bwping.c	Mon Jul 15 19:23:02 2019
***************
*** 164,169 ****
--- 164,173 ----
      (*transmitted_volume) += pktsize;
  }
  
+ #ifndef MSG_DONTWAIT
+ #define MSG_DONTWAIT MSG_NONBLOCK
+ #endif
+ 
  static void send_ping6(int sock, struct sockaddr_in6 *to6, size_t pktsize, uint16_t ident, bool first_in_burst, uint32_t *transmitted_number, uint64_t *transmitted_volume)
  {
      size_t            size;
*** ./Makefile.in.ORIG	Mon Jul 15 19:22:10 2019
--- ./Makefile.in	Mon Jul 15 19:22:19 2019
***************
*** 488,496 ****
  top_srcdir = @top_srcdir@
  AUTOMAKE_OPTIONS = subdir-objects
  bwping_SOURCES = include/cygwin.h include/features.h src/bwping.c
! bwping_CFLAGS = -DBUILD_BWPING -Wall -Wextra -Wpedantic
  bwping6_SOURCES = include/cygwin.h include/features.h src/bwping.c
! bwping6_CFLAGS = -DBUILD_BWPING6 -Wall -Wextra -Wpedantic
  man_MANS = man/bwping.8 man/bwping6.8
  EXTRA_DIST = man/bwping.8 man/bwping6.8
  dist_check_SCRIPTS = tests/bwping tests/bwping6
--- 488,496 ----
  top_srcdir = @top_srcdir@
  AUTOMAKE_OPTIONS = subdir-objects
  bwping_SOURCES = include/cygwin.h include/features.h src/bwping.c
! bwping_CFLAGS = -DBUILD_BWPING
  bwping6_SOURCES = include/cygwin.h include/features.h src/bwping.c
! bwping6_CFLAGS = -DBUILD_BWPING6
  man_MANS = man/bwping.8 man/bwping6.8
  EXTRA_DIST = man/bwping.8 man/bwping6.8
  dist_check_SCRIPTS = tests/bwping tests/bwping6