In a `fedora:rawhide` container started today:

```
$ dnf install hdf5-openmpi-devel hdf5-mpich-devel hdf5-devel
...
 hdf5                       x86_64 1.12.1-11.fc38
 hdf5-mpich                 x86_64 1.12.1-11.fc38
 hdf5-openmpi               x86_64 1.12.1-11.fc38
...

$ cat test.f90
program test
  use hdf5
end
```

-----------------------------------------------------------------------

With OpenMPI under `module load mpi/openmpi-x86_64`:

```
$ h5pfc -c test.f90
f951: Warning: Nonexistent include directory '/usr/lib64/gfortran/modules/openmpi/openmpi-x86_64' [-Wmissing-include-dirs]
test.f90:2:7:

    2 |   use hdf5
      |       1
Fatal Error: Cannot open module file 'hdf5.mod' for reading at (1): No such file or directory
compilation terminated.
```

The module exists here:

```
$ ls $MPI_FORTRAN_MOD_DIR/hdf5.mod
/usr/lib64/gfortran/modules/openmpi/hdf5.mod
```

One can hack h5pfc to fix it like this:

```
$ sed -i '/^includedir=/ s|/openmpi-x86_64||' /usr/lib64/openmpi/bin/h5pfc

$ h5pfc -c test.f90
# (succeeds)
```

-----------------------------------------------------------------------

With MPICH under `module load mpi/mpich-x86_64`:

```
$ h5pfc -c test.f90
f951: Warning: Nonexistent include directory '/usr/lib64/gfortran/modules/mpich/mpich-x86_64' [-Wmissing-include-dirs]
```

The module exists here:

```
$ ls $MPI_FORTRAN_MOD_DIR/hdf5.mod
/usr/lib64/gfortran/modules/mpich/hdf5.mod
```

One can hack h5pfc to fix it like this:

```
$ sed -i '/^includedir=/ s|/mpich-x86_64||' /usr/lib64/mpich/bin/h5pfc

$ h5pfc -c test.f90
# (succeeds without warning)
```