php-doc-en/reference/mbstring/configure.xml

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<section xml:id="mbstring.installation" xmlns="http://docbook.org/ns/docbook">
  &reftitle.install;
  <para>
   <literal>mbstring</literal> is a non-default extension. This means it
   is not enabled by default. You must explicitly enable the module with
   the <literal>configure</literal> option. See the
   <link linkend="install">Install</link> section for details.
  </para>
  <simpara>
   The following configure options are related to the
   <literal>mbstring</literal> module.
  </simpara>
  <para>
   <itemizedlist>
    <listitem>
     <para>
      <option role="configure">--enable-mbstring</option>: Enable
      <literal>mbstring</literal> functions. This option is
      required to use <literal>mbstring</literal> functions.
     </para>
     <para>
      <productname>libmbfl</productname> is necessary for <literal>mbstring</literal>.
      <productname>libmbfl</productname> is bundled with <literal>mbstring</literal>.
      Before PHP 7.3.0, if <productname>libmbfl</productname> is already installed on the system,
      <option role="configure">--with-libmbfl[=DIR]</option> can be specified to use 
      the installed library.
     </para>
    </listitem>
    <listitem>
     <para>
      <option role="configure">--disable-mbregex</option>: Disable
      regular expression functions with multibyte character support.
     </para>
    </listitem>
   </itemizedlist>
  </para>
</section>

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