diff --git a/src/lib_json/CMakeLists.txt b/src/lib_json/CMakeLists.txt
index 3bf5e1a..f21069b 100644
--- a/src/lib_json/CMakeLists.txt
+++ b/src/lib_json/CMakeLists.txt
@@ -11,7 +11,14 @@ ELSE(JSONCPP_LIB_BUILD_SHARED)
 ENDIF(JSONCPP_LIB_BUILD_SHARED)
 
 if( CMAKE_COMPILER_IS_GNUCXX )
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=strict-aliasing")
+  #Get compiler version.
+  execute_process( COMMAND ${CMAKE_CXX_COMPILER} -dumpversion
+                   OUTPUT_VARIABLE GNUCXX_VERSION )
+ 
+  #-Werror=* was introduced -after- GCC 4.1.2
+  if( GNUCXX_VERSION VERSION_GREATER 4.1.2 )
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=strict-aliasing")
+  endif()
 endif( CMAKE_COMPILER_IS_GNUCXX )
 
 SET( JSONCPP_INCLUDE_DIR ../../include )