Index: /trunk/src/VBox/Additions/linux/installer/vboxadd-x11.sh
===================================================================
--- /trunk/src/VBox/Additions/linux/installer/vboxadd-x11.sh	(revision 29611)
+++ /trunk/src/VBox/Additions/linux/installer/vboxadd-x11.sh	(revision 29612)
@@ -323,5 +323,6 @@
             vboxmouse_src=vboxmouse_drv_18.so
             doxorgconfd="true"
-            setupxorgconf=""
+            # Fedora 13 looks likely to ship without vboxvideo detection
+            test "$system" = "redhat" || setupxorgconf=""
             ;;
         1.6.99.* | 1.7.* )