diff --git a/CMakeLists.txt b/CMakeLists.txt
index 112d1d7734..d8052a9aa9 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -129,8 +129,9 @@ add_definitions(-DLITTLEENDIAN_CPU=1)
 #
 # Linux Compiler options
 #
-set(CMAKE_CXX_FLAGS "-std=c++11 ")
+set(CMAKE_CXX_FLAGS "$ENV{CXXFLAGS}")
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fexceptions")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-math-errno")