$NetBSD$

* allow compiler extensions for compiler based alloca
* install manpages into PKGMANDIR

--- CMakeLists.txt.orig	2022-02-19 05:05:00.000000000 +0000
+++ CMakeLists.txt
@@ -4,7 +4,7 @@ cmake_minimum_required(VERSION 2.6.0 FAT
 
 set(PRODUCT_VERSION "1.10.3")
 set(PRODUCT_DATE    "February 18, 2022")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+set(CMAKE_CXX_STANDARD 11)
 
 OPTION(WITH_ZRTP		"Enable ZRTP encrypted calls" OFF)
 OPTION(WITH_SPEEX		"Enable the Speex codec" OFF)
@@ -19,6 +19,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_C
 
 include (CheckIncludeFile)
 include (CheckIncludeFiles)
+include (GNUInstallDirs)
 
 find_package(LibXml2 REQUIRED)
 find_package(LibMagic REQUIRED)
@@ -159,7 +160,7 @@ install(FILES data/twinkle.svg
 	DESTINATION share/icons/hicolor/scalable/apps)
 
 install(FILES data/twinkle.1
-	DESTINATION share/man/man1)
+	DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
 
 add_subdirectory(src)