<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2383#discussion_r333039034">CONFIGURE.md</a>:</p>
<pre style='color:#555'>> @@ -131,3 +131,5 @@ If you want to deploy The Rails Port for production use, you'll need to make a f
 * The included version of the GPX importer is slow and/or completely inoperable. You should consider using [the high-speed GPX importer](https://git.openstreetmap.org/gpx-import.git/).
 * Make sure you generate the i18n files and precompile the production assets: `RAILS_ENV=production rake i18n:js:export assets:precompile`
 * Make sure the web server user as well as the rails user can read, write and create directories in `tmp/`.
+* If you want to use diff replication then you will need to install the shared library versions of the special SQL functions (see the bottom of [INSTALL.md](INSTALL.md)).
</pre>
<p>I wasn't even aware of a 3GL version, but you're right: osmosis ships one: <a href="https://github.com/openstreetmap/osmosis/blob/master/package/script/contrib/apidb_0.6_osmosis_xid_indexing.sql">https://github.com/openstreetmap/osmosis/blob/master/package/script/contrib/apidb_0.6_osmosis_xid_indexing.sql</a></p>

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