c++ -std=c++14 -o main Beam1d.g.o Data.g.o main.g.o -L /usr/local/lib -L /usr/local/include -ldeal_II -ldl -lpthread
Undefined symbols for architecture x86_64:
"tbb::internal::thread_get_id_v3()", referenced from:
tbb::this_tbb_thread::get_id() in Beam1d.g.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [main] Error 1