setting <varname>PG_CONFIG</varname> to point to its

<command>pg_config</command> program, either within the makefile

or on the <literal>make</literal> command line.

You can also select a separate installation directory for your extension

by setting the <literal>make</literal> variable <varname>prefix</varname>

on the <literal>make</literal> command line. (But this will then require

additional setup to get the server to find the extension there.)

</para>

<para>

You can select a separate directory prefix in which to install your

extension's files, by setting the <command>make</command> variable

<varname>prefix</varname> when executing <literal>make install</literal>

like so:

<programlisting>

make install prefix=/usr/local/postgresql

</programlisting>

This will install the extension control and SQL files into

<filename>/usr/local/postgresql/share</filename> and the shared modules into

<filename>/usr/local/postgresql/lib</filename>. If the prefix does not

include the strings <literal>postgres</literal> or

<literal>pgsql</literal>, such as

<programlisting>

make install prefix=/usr/local/extras

</programlisting>

then <literal>postgresql</literal> will be appended to the directory

names, installing the control and SQL files into

<filename>/usr/local/extras/share/postgresql/extension</filename> and the

shared modules into <filename>/usr/local/extras/lib/postgresql</filename>.

Either way, you'll need to set <xref

linkend="guc-extension-control-path"/> and <xref

linkend="guc-dynamic-library-path"/> to enable the

<productname>PostgreSQL</productname> server to find the files:

<programlisting>

extension_control_path = '/usr/local/extras/share/postgresql/extension:$system'

dynamic_library_path = '/usr/local/extras/lib/postgresql:$libdir'

</programlisting>

</para>

<para>