<blockquote>
<p>so an out-of-date package cache is the likely culprit?</p>
</blockquote>
<p>That's my guess, and why I tried this PR (which is admittedly experimental).</p>
<p>It would be good if someone could confirm that the changes make sense (I'm not familiar with travis at all).</p>
<p>Thanks,<br>
Alistair</p>

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