<p>It turns out the hints were there in your output, I just didn't see them:</p>

<pre><code>$ ldd libarmadillo.so
...
libatlas.so.3 =&gt; /usr/lib64/atlas/libatlas.so.3 (0x00007f27ee0f2000)
libblas.so.3 =&gt; /usr/lib64/libblas.so.3 (0x00007f27ede9a000)
...
</code></pre>

<p>Does there exist a file <code>/usr/lib64/atlas/libblas.so.3</code>?  If so, can you run the following two commands:</p>

<pre><code>$ strings /usr/lib64/libblas.so.3 | grep cblas | wc -l
$ strings /usr/lib64/atlas/libblas.so.3 | grep cblas | wc -l
</code></pre>

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