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

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<section xml:id="intl.installation" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.install;
 <para>
  This extension may be installed using the bundled version as of PHP 5.3.0,
  or as a PECL extension as of PHP 5.2.0. In other words, there are two methods
  to install the intl extension.
 </para>
 <para>
  &pecl.info;
  <link xlink:href="&url.pecl.package;intl">&url.pecl.package;intl</link>.
 </para>
 <para>
  Alternatively, <literal>--enable-intl</literal> will enable the bundled
  version while compiling PHP.
 </para>
 <para>
  If your ICU is installed to a non-standard directory then you might want to
  specify its location in
  <constant>LD_LIBRARY_PATH</constant>
  environment variable so that dynamic linker can find it:
 </para>
 <screen>$ export LD_LIBRARY_PATH=/opt/icu/lib</screen>
 <para>
  Otherwise, if PHP and ICU are installed to their default locations, then the
  additional options to `configure' are not needed.
 </para>
</section>

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