diff --git a/cmake/env.inc b/cmake/env.inc
index 356bd61442c51a9b697e375e9fe7ee7c1ad3d24b..fa15ec6aee01a619139417fceb21b3a71bd96364 100755
--- a/cmake/env.inc
+++ b/cmake/env.inc
@@ -39,7 +39,7 @@ SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${COMMON_C_FLAGS} ${DEBUG_FLAGS}
 SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${COMMON_C_FLAGS} ${RELEASE_FLAGS}")
 
 # Set c++ compiler options
-SET(COMMON_CXX_FLAGS "${COMMON_FLAGS} -std=c++11")
+SET(COMMON_CXX_FLAGS "${COMMON_FLAGS} -std=c++11 -Wno-unused-function")
 SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${COMMON_CXX_FLAGS} ${DEBUG_FLAGS}")
 SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${COMMON_CXX_FLAGS} ${RELEASE_FLAGS}")