Could you try with the latest git repo? We just merged this PR https://github.com/pmodels/mpich/pull/5722 to fix this issue. FYI, we have changed the way we configure test suite. In the main branch, test suite, i.e. test/mpi​, is now configured independently from the mpich configure. To run test suite, after build and installing mpich, go to test/mpi​, run ./autogen.sh ./configure make testing We added rule in the mpich Makefile so make testing​ will do above as a convenience. But if you encounter issues or need customized test configuration, try configure test/mpi separately. -- Hui Zhou [https://opengraph.githubassets.com/30d95a98b05bdcdc5c065f2271e7272120785210f8cf33aa46c1a0dd0f55f901/pmodels/mpich/pull/5722]<https://github.com/pmodels/mpich/pull/5722> test/config: minor fixes by raffenet · Pull Request #5722 · pmodels/mpich<https://github.com/pmodels/mpich/pull/5722> Pull Request Description Improve configure output Fix dtpools build issue Author Checklist Provide Description Particularly focus on why, not what. Reference background, issues, test failures, ... github.com ________________________________ From: Gregor Corbin via discuss <[email protected]> Sent: Thursday, December 16, 2021 11:48 AM To: [email protected] <[email protected]> Cc: Gregor Corbin <[email protected]> Subject: [mpich-discuss] make testing fails when building from git(main) Dear MPICH devs, I want to use the MPI test suite provided with MPICH to test an MPI wrapper library I am developing (the MPI wrapper for Score-P). As a first step, I tried to check out the latest version from git, build everything and then run the test suite with `make testing`. I can build MPICH itself without a problem and the example cpi program runs just fine. However, during `make testing` I run into lots of errors of the form In file included from dtpools.c:6: ../include/dtpools_internal.h:12:10: fatal error: mpi.h: No such file or directory 12 | #include "mpi.h" | ^~~~~~~ compilation terminated. This happens only with the git version, not with the tarball version(mpich-4.0b1). I attached all the program outputs and log files. Any help is appreciated. As I workaround I first built MPICH itself, then did './configure CC=mpicc ...', in the test/mpi directory and then directly use the runtests script. This works for now, but is surely not how it was intended. Kind regards, Gregor Corbin