Xcode problem while executing C OpenMPI project

On an M3 Pro, in Xcode, I want to run a simple C source file:

#include <mpi.h>
#include <stdio.h>

int main(int argc, char** argv) {
    MPI_Init(&argc, &argv);

    int world_size;
    MPI_Comm_size(MPI_COMM_WORLD, &world_size);

    int world_rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

    printf("hello from process %d of %d total processes\n", world_rank, world_size);

    MPI_Finalize();
    return 0;
}

It successfully builds, but it doesn’t run successfully, returning on console:

NSBundle file:///System/Library/PrivateFrameworks/MetalTools.framework/ principal class is nil because all fallbacks have failed
[Mac.station:03539] shmem: mmap: an error occurred while determining whether or not /var/folders/0j/hwf25cd97w1916m2vcbz833r0000gn/T//ompi.Mac.501/jf.0/1294860288/sm_segment.Mac.501.4d2e0000.0 could be created.
hello from process 0 of 1 total processes
Program ended with exit code: 0

What am I missing?

1. In order to build, I’ve configured the Xcode project in this way:

• Build Settings -> Header Search Paths = /opt/homebrew/opt/open-mpi/include
• Build Settings -> Library Search Paths = /opt/homebrew/opt/open-mpi/lib
• Build Settings -> Other Linker Flags = -lmpi

(brew --prefix open-mpi returns /opt/homebrew/opt/open-mpi)

2. The project builds successfully on terminal by executing:
   mpicc main.c
   and runs successfully by executing:
   mpiexec a.out, showing correctly: hello from process 1...12 of 12 total processes

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