This is the OMPI contrib system.  It is (far) less functional and
flexible than the OMPI MCA framework/component system.

Each contrib package must have a `configure.m4`.  It may optionally also
have an `autogen.subdirs` file.

If it has a `configure.m4` file, it must specify its own relevant
files to `AC_CONFIG_FILES` to create during `AC_OUTPUT` -- just like
MCA components (at a minimum, usually its own `Makefile`).  The
`configure.m4` file will be slurped up into the main `configure`
script, just like other MCA components.  Note that there is currently
no "no configure" option for contrib packages -- you *must* have a
`configure.m4` (even if all it does it call `$1`).  Feel free to fix
this situation if you want -- it probably won't not be too difficult
to extend `autogen.pl` to support this scenario, similar to how it is
done for MCA components.  :smile:

If it has an `autogen.subdirs` file, then it needs to be a
subdirectory that is autogen-able.