$NetBSD: patch-configure,v 1.1 2018/06/22 16:16:53 schmonz Exp $

Lower _XOPEN_SOURCE to fix SmartOS build.

--- configure.orig	2017-08-28 07:53:30.000000000 +0000
+++ configure
@@ -211,7 +211,7 @@ trylibs () {
 
 CC_AUTO=
 CFLAGS_AUTO="$CFLAGS"
-CPPFLAGS_AUTO="-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -O2 $CPPFLAGS"
+CPPFLAGS_AUTO="-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=600 -O2 $CPPFLAGS"
 LDFLAGS_AUTO="$LDFLAGS"
 LDFLAGS_NOSHARED=
 LDFLAGS_SHARED=-shared
