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<section xml:id="image.installation" xmlns="http://docbook.org/ns/docbook">
 &reftitle.install;
 <para>
  To enable GD-support configure PHP
  <option role="configure">--with-gd[=DIR]</option>, where DIR is the GD base
  install directory. To use the recommended bundled version of the GD library,
  use the configure option
  <option role="configure">--with-gd</option>.
  GD library requires <productname>libpng</productname> and
  <productname>libjpeg</productname> to compile.
  As of PHP 7.4.0, <option role="configure">--with-gd</option> becomes
  <option role="configure">--enable-gd</option> (whether to enable the
  extension at all) and <option role="configure">--with-external-gd</option>
  (to opt into using an external <productname>libgd</productname>, rather than
  the bundled one).
 </para>
 <para>
  In Windows, you'll include the GD DLL <filename>php_gd.dll</filename> as
  an extension in &php.ini;.
  Prior to PHP 8.0.0, the DLL was named <filename>php_gd2.dll</filename>.
 </para>

 <para>
  Enhance the capabilities of GD to handle more image formats by specifying
  the <literal>--with-XXXX</literal> configure switch to your PHP configure
  line.
  <table>
   <title>Supported image formats</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Image Format</entry>
      <entry>Configure Switch</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry><literal>jpeg</literal></entry>
      <entry>
       To enable support for jpeg add
       <option role="configure">--with-jpeg-dir=DIR</option>. Jpeg 6b, 7 or 8
       are supported.
       As of PHP 7.4.0, use <option role="configure">--with-jpeg</option>
       instead.
      </entry>
     </row>
     <row>
      <entry><literal>png</literal></entry>
      <entry>
       To enable support for png add
       <option role="configure">--with-png-dir=DIR</option>. Note, libpng
       requires the <link linkend="zlib.requirements">zlib library</link>,
       therefore add <option role="configure">--with-zlib-dir[=DIR]</option>
       to your configure line.
       As of PHP 7.4.0, <option role="configure">--with-png-dir</option> and
       <option role="configure">--with-zlib-dir</option> have been removed.
       <productname>libpng</productname> and <productname>zlib</productname>
       are required.
      </entry>
     </row>
     <row>
      <entry><literal>xpm</literal></entry>
      <entry>
       To enable support for xpm add
       <option role="configure">--with-xpm-dir=DIR</option>. If configure
       is not able to find the required libraries, you may add the path to
       your X11 libraries.
       As of PHP 7.4.0, use <option role="configure">--with-xpm</option>
       instead.
      </entry>
     </row>
     <row>
      <entry><literal>webp</literal></entry>
      <entry>
       To enable support for webp add <option role="configure">--with-webp-dir=DIR</option>.
       As of PHP 7.4.0, use <option role="configure">--with-webp</option>
       instead.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </table>
  <note>
   <simpara>
    When compiling PHP with libpng, you must use the same version that was
    linked with the GD library.
   </simpara>
  </note>
 </para>
 <para>
  Enhance the capabilities of GD to deal with different fonts by specifying
  the <literal>--with-XXXX</literal> configure switch to your PHP configure
  line.
  <table>
   <title>Supported font libraries</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Font library</entry>
      <entry>Configure Switch</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry><literal>FreeType 2</literal></entry>
      <entry>
       To enable support for FreeType 2 add
       <option role="configure">--with-freetype-dir=DIR</option>.
       As of PHP 7.4.0 use <option role="configure">--with-freetype</option>
       instead, which relies on <productname>pkg-config</productname>.
      </entry>
     </row>
     <row>
      <entry><literal>Native TrueType string function</literal></entry>
      <entry>
       To enable support for native TrueType string function add
       <option role="configure">--enable-gd-native-ttf</option>.
       (This option has no effect and has been removed as of PHP 7.2.0.)
      </entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </para>
</section>


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