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Running ``autogen.pl``
======================
You can now run OMPI's top-level ``autogen.pl`` script. This script
will invoke the GNU Autoconf, Automake, and Libtool commands in the
proper order and do a bunch of component discovery and housekeeping to
setup to run OMPI's top-level ``configure`` script.
Running ``autogen.pl`` may take a few minutes, depending on your
system. It's not very exciting to watch.
If you have a multi-processor system, enabling the multi-threaded
behavior in Automake 1.11 (or newer) can result in ``autogen.pl``
running faster. Do this by setting the ``AUTOMAKE_JOBS`` environment
variable to the number of processors (threads) that you want it to use
before invoking ``autogen.pl``. For example (you can put this in your
shell startup files)::
# For bash/sh/zsh:
export AUTOMAKE_JOBS=4
# For csh/tcsh:
setenv AUTOMAKE_JOBS 4
.. important:: You generally need to run ``autogen.pl`` whenever the
top-level file ``configure.ac`` changes, or any files in the
``config/`` or ``<project>/config/`` directories change (these
directories are where a lot of "include" files for Open MPI's
``configure`` script live).
.. note:: You do *NOT* need to re-run ``autogen.pl`` if you modify a
``Makefile.am``.
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