The problem is probably not related to "MPI_SEND not found". The CMake file is trying first to find if there is a build-in mpi in the compiler. Since, it did not find one, it is looking for a MPI library, which it found at the path indicated in the screenshot that you sent us.

From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Nico Clinco <nicoclinco@gmail.com>
Sent: Thursday, February 8, 2024 2:37 PM
To: ankanggao@ustc.edu.cn <ankanggao@ustc.edu.cn>
Cc: nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk>
Subject: Re: [Nektar-users] Issues with compilation

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Hello,

i have tried also defining CC=mpiCC and CCX=mpiCXX but nothing, the same problem.

I want to add that i am using the following modules:

gnu9/9.4.0

cmake/3.24.2

openmpi4

Thanks in advance,

Nicola