The openmpi packages on both CentOS 6.2 and 6.3 do not ship the I/O component (romio) that is required to use MPI I/O calls.<br />
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When I used rpmbuild to manually try and build it, I noticed that the configure script in the relevant subdirectory (ompi/mca/io/romio/romio/configure) fails but the overall build continues, so this is easy to miss.<br />
The failure is due to an autoconf issue where macros from a custom m4 file are not substituted.
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