From c32bcd704d19f1ce0164b9959447c3030634c916 Mon Sep 17 00:00:00 2001
From: Pieter Lexis <pieter.lexis@powerdns.com>
Date: Mon, 27 Jun 2016 13:02:15 +0200
Subject: [PATCH] Rec: Don't fail configure on missing fcontext.hpp

Fixes #4014
---
 pdns/recursordist/configure.ac | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pdns/recursordist/configure.ac b/pdns/recursordist/configure.ac
index 5fcf6a2c94..0ee0c5a17e 100644
--- a/pdns/recursordist/configure.ac
+++ b/pdns/recursordist/configure.ac
@@ -54,7 +54,9 @@ AC_DEFUN([PDNS_SELECT_CONTEXT_IMPL], [
       LDFLAGS="$LDFLAGS $BOOST_THREAD_LDFLAGS"
     fi
     AC_MSG_NOTICE([checking whether the Boost context library actually links...])
-    BOOST_FIND_LIB([context], [$1], [boost/context/fcontext.hpp], [[]])
+    BOOST_FIND_HEADER([boost/context/fcontext.hpp], [ : ], [
+      BOOST_FIND_LIB([context], [$1], [boost/context/fcontext.hpp], [[]])
+    ])
     case $boost_cv_lib_context in
       (yes)
         AC_MSG_NOTICE([MTasker will use the Boost context library for context switching])
-- 
2.47.2