(void *) tail_ptr.disp);
MPI_Win_lock(MPI_LOCK_EXCLUSIVE, tail_ptr.rank, 0, llist_win);
-#if USE_ACC
+#ifdef USE_ACC
MPI_Accumulate(&new_elem_ptr, sizeof(llist_ptr_t), MPI_BYTE, tail_ptr.rank,
(MPI_Aint) & (((llist_elem_t *) tail_ptr.disp)->next),
sizeof(llist_ptr_t), MPI_BYTE, MPI_REPLACE, llist_win);
llist_ptr_t next_tail_ptr;
MPI_Win_lock(MPI_LOCK_EXCLUSIVE, tail_ptr.rank, 0, llist_win);
-#if USE_ACC
+#ifdef USE_ACC
MPI_Get_accumulate(NULL, 0, MPI_DATATYPE_NULL, &next_tail_ptr,
sizeof(llist_ptr_t), MPI_BYTE, tail_ptr.rank,
(MPI_Aint) & (((llist_elem_t *) tail_ptr.disp)->next),