Using pthread in c++

Question

I am using pthread.h in a *.cc file. when I try to use pthread_exit(0); or pthread_join(mythrds[yy],NULL); it says:

Answer 1

You might try using the -pthread option to g++.

   -pthread
       Adds support for multithreading with the pthreads library.  This
       option sets flags for both the preprocessor and linker.