<tt/:empty/ (note that this is different from a parameter not having
any values).
+<p>
+(In older versions of userv, a different translation was applied:
+See <tt>https://bugs.debian.org/837391</tt>. The old translation
+can be requested (for subsequent directives) with
+<tt/include-lookup-quote-old/, which is undone by
+<tt/include-lookup-quote-new/ and <tt/reset/.)
+
<tag/<tt/include-directory <var/directory///
<item>
Read configuration from all files in directory <var/directory/ which