id="extend-pgxs-moduledir">
      <term><varname>MODULEDIR</varname></term>
      <listitem>
       <para>
        subdirectory of <literal><replaceable>prefix</replaceable>/share</literal>
        into which DATA and DOCS files should be installed
        (if not set, default is <literal>extension</literal> if
        <varname>EXTENSION</varname> is set,
        or <literal>contrib</literal> if not)
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-data">
      <term><varname>DATA</varname></term>
      <listitem>
       <para>
        random files to install into <literal><replaceable>prefix</replaceable>/share/$MODULEDIR</literal>
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-data-built">
      <term><varname>DATA_built</varname></term>
      <listitem>
       <para>
        random files to install into
        <literal><replaceable>prefix</replaceable>/share/$MODULEDIR</literal>,
        which need to be built first
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-data-tsearch">
      <term><varname>DATA_TSEARCH</varname></term>
      <listitem>
       <para>
        random files to install under
        <literal><replaceable>prefix</replaceable>/share/tsearch_data</literal>
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-docs">
      <term><varname>DOCS</varname></term>
      <listitem>
       <para>
        random files to install under
        <literal><replaceable>prefix</replaceable>/doc/$MODULEDIR</literal>
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-headers">
      <term><varname>HEADERS</varname></term>
      <term><varname>HEADERS_built</varname></term>
      <listitem>
       <para>
        Files to (optionally build and) install under
        <literal><replaceable>prefix</replaceable>/include/server/$MODULEDIR/$MODULE_big</literal>.
       </para>
       <para>
        Unlike <literal>DATA_built</literal>, files in <literal>HEADERS_built</literal>
        are not removed by the <literal>clean</literal> target; if you want them removed,
        also add them to <literal>EXTRA_CLEAN</literal> or add your own rules to do it.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-headers-module">
      <term><varname>HEADERS_$MODULE</varname></term>
      <term><varname>HEADERS_built_$MODULE</varname></term>
      <listitem>
       <para>
        Files to install (after building if specified) under
        <literal><replaceable>prefix</replaceable>/include/server/$MODULEDIR/$MODULE</literal>,
        where <literal>$MODULE</literal> must be a module name used
        in <literal>MODULES</literal> or <literal>MODULE_big</literal>.
       </para>
       <para>
        Unlike <literal>DATA_built</literal>, files in <literal>HEADERS_built_$MODULE</literal>
        are not removed by the <literal>clean</literal> target; if you want them removed,
        also add them to <literal>EXTRA_CLEAN</literal> or add your own rules to do it.
       </para>
       <para>
        It is legal to use both variables for the same module, or any
        combination, unless you have two module names in the
        <literal>MODULES</literal> list that differ only by the presence of a
        prefix <literal>built_</literal>, which would cause ambiguity. In
        that (hopefully unlikely) case, you should use only the
        <literal>HEADERS_built_$MODULE</literal> variables.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-scripts">
      <term><varname>SCRIPTS</varname></term>
      <listitem>
       <para>
        script files (not binaries) to install into
        <literal><replaceable>prefix</replaceable>/bin</literal>
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="extend-pgxs-scripts-built">
      <term><varname>SCRIPTS_built</varname></term>