diff --git a/CMakeLists.txt b/CMakeLists.txt
index 028970420..37f22289b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,11 +73,9 @@ jsoncpp_parse_version( ${JSONCPP_VERSION} JSONCPP_VERSION )
 MESSAGE(STATUS "JsonCpp Version: ${JSONCPP_VERSION_MAJOR}.${JSONCPP_VERSION_MINOR}.${JSONCPP_VERSION_PATCH}")
 # File version.h is only regenerated on CMake configure step
 CONFIGURE_FILE( "${PROJECT_SOURCE_DIR}/src/lib_json/version.h.in"
-                "${PROJECT_SOURCE_DIR}/include/json/version.h"
-                NEWLINE_STYLE UNIX )
+                "${PROJECT_SOURCE_DIR}/include/json/version.h" )
 CONFIGURE_FILE( "${PROJECT_SOURCE_DIR}/version.in"
-                "${PROJECT_SOURCE_DIR}/version"
-                NEWLINE_STYLE UNIX )
+                "${PROJECT_SOURCE_DIR}/version" )
 
 macro(UseCompilationWarningAsError)
 	if ( MSVC )
@@ -104,7 +102,7 @@ endif()
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   # using regular Clang or AppleClang
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wconversion -Wshadow -Wno-sign-conversion")
-elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND GNUCXX_VERSION VERSION_GREATER 4.6.3 )
   # using GCC
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wconversion -Wshadow -Wextra")
   # not yet ready for -Wsign-conversion
diff --git a/include/json/reader.h b/include/json/reader.h
index 0a1574fad..a2d002e45 100644
--- a/include/json/reader.h
+++ b/include/json/reader.h
@@ -333,9 +333,9 @@ class JSON_API CharReaderBuilder : public CharReader::Factory {
   Json::Value settings_;
 
   CharReaderBuilder();
-  ~CharReaderBuilder() override;
+  ~CharReaderBuilder();
 
-  CharReader* newCharReader() const override;
+  CharReader* newCharReader() const;
 
   /** \return true if 'settings' are legal and consistent;
    *   otherwise, indicate bad settings via 'invalid'.
diff --git a/include/json/value.h b/include/json/value.h
index 1cfda0774..d711da3f5 100644
--- a/include/json/value.h
+++ b/include/json/value.h
@@ -40,8 +40,8 @@ namespace Json {
 class JSON_API Exception : public std::exception {
 public:
   Exception(std::string const& msg);
-  ~Exception() throw() override;
-  char const* what() const throw() override;
+  ~Exception() throw();
+  char const* what() const throw();
 protected:
   std::string msg_;
 };
diff --git a/include/json/writer.h b/include/json/writer.h
index f94aa1fe7..064b1b678 100644
--- a/include/json/writer.h
+++ b/include/json/writer.h
@@ -112,12 +112,12 @@ class JSON_API StreamWriterBuilder : public StreamWriter::Factory {
   Json::Value settings_;
 
   StreamWriterBuilder();
-  ~StreamWriterBuilder() override;
+  ~StreamWriterBuilder();
 
   /**
    * \throw std::exception if something goes wrong (e.g. invalid settings)
    */
-  StreamWriter* newStreamWriter() const override;
+  StreamWriter* newStreamWriter() const;
 
   /** \return true if 'settings' are legal and consistent;
    *   otherwise, indicate bad settings via 'invalid'.
@@ -158,7 +158,7 @@ class JSON_API FastWriter : public Writer {
 
 public:
   FastWriter();
-  ~FastWriter() override {}
+  ~FastWriter() {}
 
   void enableYAMLCompatibility();
 
@@ -172,7 +172,7 @@ class JSON_API FastWriter : public Writer {
   void omitEndingLineFeed();
 
 public: // overridden from Writer
-  std::string write(const Value& root) override;
+  std::string write(const Value& root);
 
 private:
   void writeValue(const Value& value);
@@ -210,14 +210,14 @@ class JSON_API FastWriter : public Writer {
 class JSON_API StyledWriter : public Writer {
 public:
   StyledWriter();
-  ~StyledWriter() override {}
+  ~StyledWriter() {}
 
 public: // overridden from Writer
   /** \brief Serialize a Value in <a HREF="http://www.json.org/">JSON</a> format.
    * \param root Value to serialize.
    * \return String containing the JSON document that represents the root value.
    */
-  std::string write(const Value& root) override;
+  std::string write(const Value& root);
 
 private:
   void writeValue(const Value& value);
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 2eae15de9..8d1bd3fef 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -47,7 +47,7 @@ static int       stackDepth_g = 0;  // see readValue()
 
 namespace Json {
 
-#if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
+#if ( !defined(__APPLE__) && __cplusplus >= 201103L ) || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
 typedef std::unique_ptr<CharReader> CharReaderPtr;
 #else
 typedef std::auto_ptr<CharReader>   CharReaderPtr;
@@ -1901,7 +1901,7 @@ class OurCharReader : public CharReader {
   {}
   bool parse(
       char const* beginDoc, char const* endDoc,
-      Value* root, std::string* errs) override {
+      Value* root, std::string* errs) {
     bool ok = reader_.parse(beginDoc, endDoc, *root, collectComments_);
     if (errs) {
       *errs = reader_.getFormattedErrorMessages();
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 0b2d7d5be..0d960b331 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -73,7 +73,7 @@
 
 namespace Json {
 
-#if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
+#if ( !defined(__APPLE__) && __cplusplus >= 201103L ) || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
 typedef std::unique_ptr<StreamWriter> StreamWriterPtr;
 #else
 typedef std::auto_ptr<StreamWriter>   StreamWriterPtr;
@@ -837,7 +837,7 @@ struct BuiltStyledStreamWriter : public StreamWriter
       std::string const& endingLineFeedSymbol,
       bool useSpecialFloats,
       unsigned int precision);
-  int write(Value const& root, std::ostream* sout) override;
+  int write(Value const& root, std::ostream* sout);
 private:
   void writeValue(Value const& value);
   void writeArrayValue(Value const& value);