diff --git a/r.php b/r.php
index 3292af8f6be..2d59ba587f4 100644
--- a/r.php
+++ b/r.php
@@ -28,5 +28,29 @@
 define('ABORT_AFTER_CONFIG', true);
 require_once('config.php');
 
+// Load the rest of the setup.
+require_once("{$CFG->libdir}/setuplib.php");        // Functions that MUST be loaded first.
+
+// Load up standard libraries.
+require_once("{$CFG->libdir}/filterlib.php");       // Functions for filtering test as it is output.
+require_once("{$CFG->libdir}/ajax/ajaxlib.php");    // Functions for managing our use of JavaScript and YUI.
+require_once("{$CFG->libdir}/weblib.php");          // Functions relating to HTTP and content.
+require_once("{$CFG->libdir}/outputlib.php");       // Functions for generating output.
+require_once("{$CFG->libdir}/navigationlib.php");   // Class for generating Navigation structure.
+require_once("{$CFG->libdir}/dmllib.php");          // Database access.
+require_once("{$CFG->libdir}/datalib.php");         // Legacy lib with a big-mix of functions.
+require_once("{$CFG->libdir}/accesslib.php");       // Access control functions.
+require_once("{$CFG->libdir}/deprecatedlib.php");   // Deprecated functions included for backward compatibility.
+require_once("{$CFG->libdir}/moodlelib.php");       // Other general-purpose functions.
+require_once("{$CFG->libdir}/enrollib.php");        // Enrolment related functions.
+require_once("{$CFG->libdir}/pagelib.php");         // Library that defines the moodle_page class, used for $PAGE.
+require_once("{$CFG->libdir}/blocklib.php");        // Library for controlling blocks.
+require_once("{$CFG->libdir}/grouplib.php");        // Groups functions.
+require_once("{$CFG->libdir}/sessionlib.php");      // All session and cookie related stuff.
+require_once("{$CFG->libdir}/editorlib.php");       // All text editor related functions and classes.
+require_once("{$CFG->libdir}/messagelib.php");      // Messagelib functions.
+require_once("{$CFG->libdir}/modinfolib.php");      // Cached information on course-module instances.
+require_once("{$CFG->dirroot}/cache/lib.php");       // Cache API.
+
 $router = \core\di::get(\core\router::class);
 $router->serve();