dnsdist: Fix FTBFS with GCC 11

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

lfs/dnsdist

@@ -31,14 +31,12 @@ DL_FILE    = $(THISAPP).tar.bz2
 DL_FROM    = $(URL_IPFIRE)
 DIR_APP    = $(DIR_SRC)/$(THISAPP)
 TARGET     = $(DIR_INFO)/$(THISAPP)
-#SUP_ARCH   = x86_64
-SUP_ARCH   = none
 PROG       = dnsdist
 PAK_VER    = 9
 
 DEPS       =
 
-MAX_PARALLELISM = $(shell echo $$(( $(SYSTEM_MEMORY) / 2048)))
+MAX_PARALLELISM = $(shell echo $$(( $(SYSTEM_MEMORY) / 2048 )))
 
 ###############################################################################
 # Top-level Rules
@@ -81,6 +79,7 @@ $(subst %,%_MD5,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	@$(PREBUILD)
 	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE)
+	cd $(DIR_APP) && patch -Np2 < $(DIR_SRC)/src/patches/dnsdist-1.6.0-missing-mutex-header.patch
 	cd $(DIR_APP) && ./configure \
 		--prefix=/usr \
 		--sysconfdir=/etc \

src/patches/dnsdist-1.6.0-missing-mutex-header.patch

@@ -0,0 +1,22 @@
+From 65bb0ab32a449d8fb8cf9a4802d16ba4912d9fc4 Mon Sep 17 00:00:00 2001
+From: Remi Gacogne <remi.gacogne@powerdns.com>
+Date: Tue, 25 May 2021 10:09:43 +0200
+Subject: [PATCH] dnsdist-1.6.x: Backport a missing mutex header
+
+---
+ pdns/lock.hh | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/pdns/lock.hh b/pdns/lock.hh
+index 09299d7979d..0e88118c564 100644
+--- a/pdns/lock.hh
++++ b/pdns/lock.hh
+@@ -20,6 +20,8 @@
+  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+  */
+ #pragma once
++
++#include <mutex>
+ #include <shared_mutex>
+ 
+ class ReadWriteLock