--- src/shrpx_config.cc~ 2017-07-02 10:46:31.000000000 +0200
+++ src/shrpx_config.cc 2017-07-09 22:29:41.000000000 +0200
+#ifdef __APPLE__ // this block only for Macs
+# ifndef __MAC_OS_X_VERSION_MIN_REQUIRED // are AvailabilityMacros.h or Availability.h not yet included?
+# if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 // then for Leopard and later…
+# include <Availability.h> // …either include this…
+# include <AvailabilityMacros.h> // …or include that
+# if __MAC_OS_X_VERSION_MIN_REQUIRED < 1060 // and for some OS versions do this…
+# define AI_NUMERICSERV 0
+# endif // finish OS version discrimination
+#endif // finish Apple case