--- a/tools/qdoc3/linguistgenerator.h	Wed Jun 23 19:07:03 2010 +0300
+++ b/tools/qdoc3/linguistgenerator.h	Tue Jul 06 15:10:48 2010 +0300
@@ -70,7 +70,7 @@
     virtual void generateClassLikeNode(const InnerNode *inner,
                                        CodeMarker *marker);
     virtual void generateFakeNode( const FakeNode *fake, CodeMarker *marker );
-    virtual QString fileExtension(const Node *node);
+    virtual QString fileExtension(const Node *node) const;
 
     QList<QDomElement> generateIndexSections(QDomDocument &document,
                        const Node *node, CodeMarker *marker);