use AC_LANG_SOURCE instead of AC_LANG_PROGRAM to avoid a nested function

definition

net/ntp/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.72 2017/03/27 11:33:40 bluhm Exp $
+# $OpenBSD: Makefile,v 1.73 2017/09/25 12:41:07 sthen Exp $
 
 COMMENT=	Network Time Protocol reference implementation
 
@@ -7,6 +7,7 @@ COMMENT=	Network Time Protocol reference implementation
 # 'pl' for local use.
 
 VERSION=	4.2.8p10
+REVISION=	0
 DISTNAME=	ntp-${VERSION}
 PKGNAME=	ntp-${VERSION:S/p/pl/}
 CATEGORIES=	net
@@ -25,7 +26,8 @@ WANTLIB += m pthread ssl termcap
 # enabling SEPARATE_BUILD causes the parser to be rebuilt .y -> .c,
 # which requires bison
 
-CONFIGURE_STYLE=  gnu
+CONFIGURE_STYLE=  autoconf
+AUTOCONF_VERSION= 2.69
 
 CONFIGURE_ARGS=	--docdir=${TRUEPREFIX}/share/doc/ntp \
 		--enable-parse-clocks \

net/ntp/patches/patch-configure_ac

@@ -0,0 +1,24 @@
+$OpenBSD: patch-configure_ac,v 1.4 2017/09/25 12:41:07 sthen Exp $
+
+Index: configure.ac
+--- configure.ac.orig
++++ configure.ac
+@@ -962,7 +962,7 @@ case "$ac_cv_func_recvmsg" in
+ 	    compiled=no
+ 	    for ntp_cv_struct_iovec_help in '0' '1'; do
+ 		AC_COMPILE_IFELSE(
+-		    [AC_LANG_PROGRAM(
++		    [AC_LANG_SOURCE(
+ 			[[
+ 			    #ifdef HAVE_SYS_TYPES_H
+ 			    # include <sys/types.h>
+@@ -973,8 +973,7 @@ case "$ac_cv_func_recvmsg" in
+ 			    #if $ntp_cv_struct_iovec_help
+ 			    # include <sys/uio.h>
+ 			    #endif
+-			]],
+-			[[
++
+ 			    void foo(void) {
+ 				ssize_t x;
+ 				int s = 0;