c++ - Integrating google protocol buffers in ns3 -

i'm using google protocol buffers in ns3 , seem getting errors:

./libns3-dev-internet-debug.so: undefined reference google::protobuf::message::checktypeandmergefrom(google::protobuf::messagelite const&)' ./libns3-dev-internet-debug.so: undefined reference tovtable google::protobuf::message' ./libns3-dev-internet-debug.so: undefined reference google::protobuf::internal::logmessage::logmessage(google::protobuf::loglevel, char const*, int)' ./libns3-dev-internet-debug.so: undefined reference togoogle::protobuf::message::gettypenameabi:cxx11 const' ./libns3-dev-internet-debug.so: undefined reference google::protobuf::message::initializationerrorstring[abi:cxx11]() const' ./libns3-dev-internet-debug.so: undefined reference togoogle::protobuf::unknownfieldset::clearfallback()' ./libns3-dev-internet-debug.so: undefined reference google::protobuf::message::spaceused() const' ./libns3-dev-internet-debug.so: undefined reference togoogle::protobuf::internal::logmessage::~logmessage()' ./libns3-dev-internet-debug.so: undefined reference typeinfo google::protobuf::message' ./libns3-dev-internet-debug.so: undefined reference togoogle::protobuf::descriptorpool::findfilebyname(std::__cxx11::basic_string, std::allocator > const&) const' ./libns3-dev-internet-debug.so: undefined reference google::protobuf::internal::generatedmessagereflection::generatedmessagereflection(google::protobuf::descriptor const*, google::protobuf::message const*, int const*, int, int, int, google::protobuf::descriptorpool const*, google::protobuf::messagefactory*, int)' ./libns3-dev-internet-debug.so: undefined reference togoogle::protobuf::io::codedinputstream::readlittleendian64fallback(unsigned long*)' ./libns3-dev-internet-debug.so: undefined reference `google::protobuf::messagefactory::generated_factory()'

please let me know if found fix problem. in advance!

p.s: i'm using ns-dev version , google protocol buffer version 2.4.1