<blockquote>
<p>So as far as I can tell, Armadillo is built correctly against HDF5.</p>
</blockquote>

<p>I don't think this is correct.  If Armadillo is claiming that it does not have HDF5 support (which it is: <code>Mat::load(): unsupported file type</code>), then there must have been some error in the configuration process.  Can you paste or find some way to show me the <code>armadillo_bits/config.hpp</code> that results from Homebrew's Armadillo configuration and installation script?</p>

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