diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5cac788..93f804d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -110,7 +110,9 @@ option(BUILD_WITH_CXX_11 "Build jsoncpp_lib with C++11 standard." ON)
 ##  To compatible with C++0x and C++1x
 set(CMAKE_MINIMUN_CXX_STANDARD 98)
 if(CMAKE_COMPILER_IS_GNUCXX)
-  set(CMAKE_CXX_COMPILER "/usr/bin/g++")
+  if(NOT CMAKE_CXX_COMPILER)
+    set(CMAKE_CXX_COMPILER "/usr/bin/g++")
+  endif()
   execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE CXX_VERSION)
   if(CXX_VERSION VERSION_GREATER 4.8.0)
       if(BUILD_WITH_CXX_11)