Undefined symbols for architecture x86_64:
  "boost::system::system_category()", referenced from:
      Nektar::LibUtilities::FieldIO::AddInfoTag(std::__1::shared_ptr<Nektar::LibUtilities::TagWriter>, std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::less<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > > const&) in FieldIO.cpp.o
      __GLOBAL__sub_I_FieldIO.cpp in FieldIO.cpp.o
  "boost::system::generic_category()", referenced from:
      boost::unique_lock<boost::mutex>::lock() in ArrayEqualityComparison.cpp.o
      boost::mutex::lock() in ArrayEqualityComparison.cpp.o
      boost::unique_lock<boost::mutex>::lock() in CompressData.cpp.o
      boost::mutex::lock() in CompressData.cpp.o
      boost::unique_lock<boost::mutex>::lock() in CsvIO.cpp.o
      boost::mutex::lock() in CsvIO.cpp.o
      boost::unique_lock<boost::mutex>::lock() in Equation.cpp.o
      ...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[2]: *** [library/LibUtilities/CMakeFiles/LibUtilities.dir/build.make:1066: library/LibUtilities/libLibUtilities.4.5.0.dylib] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:873: library/LibUtilities/CMakeFiles/LibUtilities.dir/all] Error 2
gmake: *** [Makefile:141: all] Error 2