if DMX
DMX_SUBDIRS = dmx
endif
if XORG
XORG_SUBDIRS = xfree86
if XVFB
XVFB_SUBDIRS = vfb
if XWIN
XWIN_SUBDIRS = xwin
SUBDIRS = \
$(XORG_SUBDIRS) \
$(XWIN_SUBDIRS) \
$(XVFB_SUBDIRS) \
$(DMX_SUBDIRS)