remove compilation warning on debian 8.2, coming from gtest includes

simon ninon · simon ninon · commit d4d9305ed026 · 2015-11-15T12:34:00.000-06:00
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
@@ -14,7 +14,7 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 ###
 # includes
 ###
-include_directories(${PROJECT_SOURCE_DIR}/includes
+include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/includes
                     ${CPP_REDIS_INCLUDES}
                     ${GTEST_INCLUDES})
 
