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

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<section id="imap.installation">
 &reftitle.install;
 <para>
  To get these functions to work, you have to compile PHP with
  <option role="configure">--with-imap[=DIR]</option>, where DIR is the
  c-client install prefix.  From our example above, you would use 
  <option role="configure">--with-imap=/usr/local/imap-2000b</option>.
  This location depends on where you created this directory according to the
  description above.  Windows users may include the 
  <filename>php_imap.dll</filename> DLL in &php.ini;.
  IMAP is not supported on systems earlier that Windows 2000. This is because it
  uses encryption functions in order to enable SSL connections to the mail
  servers.
 </para>
 <note>
  <simpara>
   Depending how the c-client was configured, you might also need to add
   <option role="configure">--with-imap-ssl=/path/to/openssl/</option>
   and/or <option role="configure">--with-kerberos=/path/to/kerberos</option>
   into the PHP configure line.
  </simpara>
 </note>

 &warn.imaprecodeyaz;

</section>

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