prog.c: In function ‘main’:
prog.c:8:0: warning: ignoring #pragma omp parallel [-Wunknown-pragmas]
#pragma omp parallel shared(a) private(id)
/home/TzY9C7/ccmXDSuM.o: In function `main':
prog.c:(.text.startup+0xa): undefined reference to `omp_set_num_threads'
prog.c:(.text.startup+0x30): undefined reference to `omp_get_thread_num'
collect2: error: ld returned 1 exit status