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<section xml:id="snmp.installation" xmlns="http://docbook.org/ns/docbook">
 &reftitle.install;
 <para>
  PHP 5.3.0, 5.3.1 and 5.3.2 do not have SNMP support. SNMP support has been restored in PHP 5.3.3.
 </para>
 <para>
  The Windows distribution of Net-SNMP contains support files for SNMP in the
  <filename class="directory">mibs</filename> directory. This directory
  should added to Windows' environment variables, as MIBDIRS, with the
  value being the full path to the <filename class="directory">mibs</filename> directory:
  e.g. <filename class="directory">c:\usr\mibs</filename>.
 </para>

 <para>
  Important notes for PHP prior to 5.4.0: In order to use the UCD <acronym>SNMP</acronym> package, you need to define
  <literal>NO_ZEROLENGTH_COMMUNITY</literal> to <literal>1</literal> before 
  compiling it. After configuring UCD <acronym>SNMP</acronym>, edit <filename>config.h</filename> 
  or <filename>acconfig.h</filename> and search for
  <literal>NO_ZEROLENGTH_COMMUNITY</literal>. Uncomment the <literal>#define</literal> line. It 
  should look like this afterwards:
  <programlisting role="c">
<![CDATA[
#define NO_ZEROLENGTH_COMMUNITY 1
]]>
  </programlisting>
  Now compile PHP <option role="configure">--with-snmp[=DIR]</option>.
 </para>
 <para>
  If you see strange segmentation faults in combination with <acronym>SNMP</acronym> commands,
  you did not follow the above instructions. If you do not want to recompile
  UCD <acronym>SNMP</acronym>, you can compile PHP with the 
  <option role="configure">--enable-ucd-snmp-hack</option> switch which
  will work around the misfeature.
 </para>
</section>

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