<p>The <code>strcasestr(3)</code> function is non-standard, so we must add the <a href="https://www.gnu.org/software/gnulib/manual/html_node/strcasestr.html">appropriate Gnulib module</a> (as I <a href="https://github.com/monitoring-plugins/monitoring-plugins/issues/1233#issuecomment-34872523">mentioned</a> in <a href="https://github.com/monitoring-plugins/monitoring-plugins/issues/1233" class="issue-link" title="check_dig is case sensitive">#1233</a>).  I can do that for the 2.2 release, just didn't get to that yet.</p>

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