diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2747ae04..50779ae7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,7 +21,6 @@ SET (exec_prefix "\${prefix}")
 SET (libdir "\${exec_prefix}/lib")
 SET (includedir "\${prefix}/include")
 SET (GNUCXX_STD_SUPPORT_VERSION "4.3")
-SET (GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION "4.4")
 
 OPTION (MSGPACK_CXX11 "Using c++11 compiler" OFF)
 OPTION (MSGPACK_32BIT "32bit compile" OFF)
@@ -204,16 +203,6 @@ IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     SET_PROPERTY (TARGET msgpackc-static APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
 ENDIF ()
 
-IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-    IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
-        (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
-        IF (MSGPACK_ENABLE_SHARED)
-            SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-        ENDIF ()
-        SET_PROPERTY (TARGET msgpackc-static APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-    ENDIF ()
-ENDIF ()
-
 IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
     IF (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
         STRING(REGEX REPLACE "/W[0-4]" "/W3 /WX" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
diff --git a/example/boost/CMakeLists.txt b/example/boost/CMakeLists.txt
index 46eb04bc..054f27ad 100644
--- a/example/boost/CMakeLists.txt
+++ b/example/boost/CMakeLists.txt
@@ -19,13 +19,6 @@ FOREACH (source_file ${exec_PROGRAMS})
         SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
     ENDIF ()
 
-    IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-        IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
-            (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
-        SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-        ENDIF ()
-    ENDIF ()
-
     IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
         IF (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
             STRING(REGEX REPLACE "/W[0-4]" "/W3 /WX" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
diff --git a/example/c/CMakeLists.txt b/example/c/CMakeLists.txt
index d9386ea9..91c90c28 100644
--- a/example/c/CMakeLists.txt
+++ b/example/c/CMakeLists.txt
@@ -27,13 +27,6 @@ FOREACH (source_file ${exec_PROGRAMS})
         SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
     ENDIF ()
 
-    IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-        IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
-            (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
-        SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-        ENDIF ()
-    ENDIF ()
-
     IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
         IF (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
             STRING(REGEX REPLACE "/W[0-4]" "/W3 /WX" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
diff --git a/example/cpp03/CMakeLists.txt b/example/cpp03/CMakeLists.txt
index 88e8b88d..6fee0cc2 100644
--- a/example/cpp03/CMakeLists.txt
+++ b/example/cpp03/CMakeLists.txt
@@ -100,13 +100,6 @@ FOREACH (source_file ${with_boost_lib_PROGRAMS})
         SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
     ENDIF ()
 
-    IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-        IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
-            (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
-        SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-        ENDIF ()
-    ENDIF ()
-
     IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
         IF (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
             STRING(REGEX REPLACE "/W[0-4]" "/W3 /WX" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
diff --git a/example/cpp11/CMakeLists.txt b/example/cpp11/CMakeLists.txt
index 4ddd4f62..994f114d 100644
--- a/example/cpp11/CMakeLists.txt
+++ b/example/cpp11/CMakeLists.txt
@@ -22,13 +22,6 @@ IF (MSGPACK_CXX11)
             SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
         ENDIF ()
 
-        IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-            IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
-                (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
-            SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-            ENDIF ()
-        ENDIF ()
-
         IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
             IF (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
                 STRING(REGEX REPLACE "/W[0-4]" "/W3 /WX" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index c0d4592b..fb490b6c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -85,13 +85,6 @@ FOREACH (source_file ${check_PROGRAMS})
         SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
     ENDIF ()
 
-    IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-        IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
-            (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
-        SET_PROPERTY (TARGET ${source_file_we} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
-        ENDIF ()
-    ENDIF ()
-
     IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
         IF (CMAKE_CXX_FLAGS MATCHES "/W[0-4] /WX")
             STRING(REGEX REPLACE "/W[0-4]" "/W3 /WX" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")