build error in linux

[jiahua1680]

hello,when I build the project in the linux,it print some error info.Can you help me? I real dont know why..
thanks.

01:50 AM root@3c1117 10.99.58.71 [hardware error] /home/ethos/DaggerGpuMiner/GpuMiner # make
g++ -O -o xdag-gpu -L/opt/AMDAPPSDK-3.0/lib/x86_64/sdk main.o Core/CommonData.o Core/Farm.o Core/Log.o Core/Miner.o Core/MinerManager.o Core/Worker.o Hash/sha256.o Hash/sha256_mod.o MinerEngine/CLMiner.o MinerEngine/XCpuMiner.o Utils/CpuInfo.o Utils/PathUtils.o Utils/Random.o Utils/Utils.o XDagCore/XAddress.o XDagCore/XHash.o XDagCore/XNetwork.o XDagCore/XBlock.o XDagCore/XPool.o XDagCore/XTaskProcessor.o XDagCore/XTaskWrapper.o XDagCore/dar/crc_c.o XDagCore/dfstools/dfslib_crypt.o XDagCore/dfstools/dfslib_string.o -lOpenCL -lpthread -lboost_system

/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libboost_system.so: undefined reference to `std::__cxx11::basic_string<char, std::char_traits, std::allocator >::_M_create(unsigned long&, unsigned long)@GLIBCXX_3.4.21'

/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libboost_system.so: undefined reference to `std::__cxx11::basic_string<char, std::char_traits, std::allocator >::~basic_string()@GLIBCXX_3.4.21'

collect2: error: ld returned 1 exit status
make: *** [xdag-gpu] Error 1