From 4d623150532e97f0b3366ef5957437fcede3395b Mon Sep 17 00:00:00 2001
From: Happy-melon <happy-melon@users.mediawiki.org>
Date: Sun, 24 Apr 2011 11:11:10 +0000
Subject: [PATCH] MathCaptcha requires the texvc functions, which are now in
 the Math extension.

---
 MathCaptcha.class.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/MathCaptcha.class.php b/MathCaptcha.class.php
index 9e3d89153..5dbbeeb99 100644
--- a/MathCaptcha.class.php
+++ b/MathCaptcha.class.php
@@ -39,7 +39,11 @@ class MathCaptcha extends SimpleCaptcha {
 
 	/** Fetch the math */
 	function fetchMath( $sum ) {
-		$math = new MathRenderer( $sum );
+		if( MWInit::classExists( 'MathRenderer' ) ){
+			$math = new MathRenderer( $sum );
+		} else {
+			throw new MWException( 'MathCaptcha requires the Math extension for MediaWiki versions 1.18 and above.' );
+		}
 		$math->setOutputMode( MW_MATH_PNG );
 		$html = $math->render();
 		return preg_replace( '/alt=".*?"/', '', $html );