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via the visibility feature that is provided by some compilers. Per default this feature is disabled, to enable it you need to configure with --enable-visibility and obviously you need a compiler with visibility support. Please refer to the wiki for more information. https://svn.open-mpi.org/trac/ompi/wiki/Visibility This commit was SVN r14582.
This file is here solely as a placeholder so that Open MPI's Automake-based installer creates the installation directory $(installdir)/openmpi (you must have disabled the MPI C++ bindings, because they would normally create this directory automatically).