$NetBSD: patch-Makefile,v 1.10 2022/07/25 06:34:30 adam Exp $

Do not hardcode _XOPEN_SOURCE.

--- Makefile.orig	2022-07-22 15:29:36.000000000 +0000
+++ Makefile
@@ -409,7 +409,7 @@ ifeq ($(TARGET),solaris)
   set_target_defaults = $(call default_opts, \
     USE_POLL USE_TPROXY USE_LIBCRYPT USE_CRYPT_H USE_GETADDRINFO USE_THREAD \
     USE_RT USE_OBSOLETE_LINKER USE_EVPORTS USE_CLOSEFROM)
-  TARGET_CFLAGS  = -DFD_SETSIZE=65536 -D_REENTRANT -D_XOPEN_SOURCE=600 -D__EXTENSIONS__
+  TARGET_CFLAGS  = -DFD_SETSIZE=65536 -D_REENTRANT -D__EXTENSIONS__
   TARGET_LDFLAGS = -lnsl -lsocket
 endif