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Filesystem requirements
=======================
.. _install-filesystem-timestamp-warning-label:
.. warning:: If you are building Open MPI on a network filesystem, the
machine you on which you are building *must* be time-synchronized
with the file server.
Specifically: Open MPI's build system *requires* accurate filesystem
timestamps. If your ``make`` output shows that it ran GNU Automake,
Autoconf, and/or Libtool, or includes warning about timestamps in the
future, perhaps looking something like this::
Warning: File `Makefile.am' has modification time 3.6e+04 s in the future
**Know that this is not normal**, and you likely have an invalid
build.
In this case, you should remove the Open MPI source directory and
start over (e.g., by re-extracting the Open MPI tarball): either
switch to build on a local filesystem, or ensure that the time on your
build machine is synchronized with the time on your file server before
building again.
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