From: Michael R. Crusoe <crusoe@debian.org>
Subject: Don't overwrite user-provided CXX flags
Forwarded: https://github.com/jydu/maffilter/pull/28
--- maffilter.orig/CMakeLists.txt
+++ maffilter/CMakeLists.txt
@@ -12,7 +12,7 @@
       FORCE)
 ENDIF()
 
-SET(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Weffc++ -Wshadow")
+add_compile_options(-std=c++11 -Wall -Weffc++ -Wshadow)
 
 
 
