From 0f6388edfa09574804aa83aedbd32d7f83219344 Mon Sep 17 00:00:00 2001
From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Mon, 11 Apr 2016 20:23:41 +0200
Subject: [PATCH] avoid generating empty if/else blocks on autoconf 2.63, fixes
 #3684

---
 m4/pdns_with_protobuf.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/m4/pdns_with_protobuf.m4 b/m4/pdns_with_protobuf.m4
index 39d4e1c969..f106c5889f 100644
--- a/m4/pdns_with_protobuf.m4
+++ b/m4/pdns_with_protobuf.m4
@@ -9,7 +9,7 @@ AC_DEFUN([PDNS_WITH_PROTOBUF], [
 
   AS_IF([test "x$with_protobuf" != "xno"], [
     AS_IF([test "x$with_protobuf" = "xyes" -o "x$with_protobuf" = "xauto"], [
-      PKG_CHECK_MODULES([PROTOBUF], [protobuf], [ ], [ ])
+      PKG_CHECK_MODULES([PROTOBUF], [protobuf], [ : ], [ : ])
       AC_CHECK_PROG([PROTOC], [protoc], [protoc])
     ])
   ])
-- 
2.47.2