int rank = 0, nprocs = 0;
int i = 0, x = 0, dst = 0, src = 0, tag = 0;
MPI_Status stat;
-#if TEST_NB
+#ifdef TEST_NB
MPI_Request req;
#endif
int sbuf[BUFSIZE], rbuf[BUFSIZE];
for (x = 0; x < ITER; x++) {
tag = x;
if (rank == dst) {
-#if TEST_NB
+#ifdef TEST_NB
MPI_Irecv(rbuf, sizeof(int) * BUFSIZE, MPI_CHAR, MPI_ANY_SOURCE, tag, MPI_COMM_WORLD,
&req);
MPI_Wait(&req, &stat);