n">errmsg_plural(const char *fmt_singular, const char *fmt_plural,
     unsigned long n, ...)</code> is like <code class="function">errmsg</code>, but with
     support for various plural forms of the message.
     <em class="replaceable"><code>fmt_singular</code></em> is the English singular format,
     <em class="replaceable"><code>fmt_plural</code></em> is the English plural format,
     <em class="replaceable"><code>n</code></em> is the integer value that determines which plural
     form is needed, an