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

<?xml version="1.0" encoding="utf-8"?>
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<section xml:id="ibase.installation" xmlns="http://docbook.org/ns/docbook">
 &reftitle.install;
 <para>
  To enable InterBase support configure PHP
  <option role="configure">--with-interbase[=DIR]</option>, where DIR is the
  InterBase base install directory, which defaults to
  <filename>/usr/interbase</filename>.
 </para>
 <note>
  <title>Note to Win32 Users</title>
  <para>
   &ext.windows.path.dll;
   <filename>gds32.dll</filename>
  </para>
  <para>
   If you installed the InterBase database server on the
   same machine PHP is running on, you will have this DLL already and
   <filename>gds32.dll</filename> will already be in 
   the <literal>PATH</literal>.
  </para>
 </note>
</section>

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