drivers/gpu/drm/qxl/qxl_fb.c:162:15: error: variable ‘qxl_defio’

[Amir]

I've also encountered same problem, the solution for me is:

--- linux-3.10-rc3.old/drivers/gpu/drm/qxl/Kconfig      2013-05-27
18:06:27.534000000 +0400
+++ linux-3.10-rc3/drivers/gpu/drm/qxl/Kconfig  2013-05-27
15:19:59.300000000 +0400
@@ -1,6 +1,7 @@
 config DRM_QXL
        tristate "QXL virtual GPU"
        depends on DRM && PCI
+       select FB_DEFERRED_IO
        select FB_SYS_FILLRECT
        select FB_SYS_COPYAREA
        select FB_SYS_IMAGEBLIT