Index: /trunk/src/VBox/Frontends/VirtualBox/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/Makefile.kmk	(revision 39796)
+++ /trunk/src/VBox/Frontends/VirtualBox/Makefile.kmk	(revision 39797)
@@ -78,5 +78,5 @@
 VirtualBox_SDKS.win = WINPSDK DXSDK
 if1of ($(KBUILD_TARGET), freebsd linux netbsd openbsd os2) # X11 + os2 ## @todo solaris
-# VirtualBox_SDKS += LIBSDL
+ VirtualBox_SDKS += LIBSDL
 endif
 
@@ -88,5 +88,5 @@
 endif
 VirtualBox_DEFS.freebsd   = VBOX_GUI_USE_QIMAGE VBOX_GUI_USE_SDL
-VirtualBox_DEFS.linux     = VBOX_GUI_USE_QIMAGE
+VirtualBox_DEFS.linux     = VBOX_GUI_USE_QIMAGE VBOX_GUI_USE_SDL
 VirtualBox_DEFS.netbsd    = VBOX_GUI_USE_QIMAGE VBOX_GUI_USE_SDL
 VirtualBox_DEFS.openbsd   = VBOX_GUI_USE_QIMAGE VBOX_GUI_USE_SDL