Looks like the gallium-0.2-radeon merge clobbered it.
# Gallium directories and
GALLIUM_AUXILIARY_DIRS = draw translate cso_cache pipebuffer tgsi sct rtasm util indices
GALLIUM_AUXILIARIES = $(foreach DIR,$(GALLIUM_AUXILIARY_DIRS),$(TOP)/src/gallium/auxiliary/$(DIR)/lib$(DIR).a)
-GALLIUM_DRIVER_DIRS = softpipe i915simple i965simple nv04 nv10 nv20 nv30 nv40 nv50 failover
+GALLIUM_DRIVER_DIRS = softpipe i915simple i965simple nv04 nv10 nv20 nv30 nv40 nv50 failover trace
GALLIUM_DRIVERS = $(foreach DIR,$(GALLIUM_DRIVER_DIRS),$(TOP)/src/gallium/drivers/$(DIR)/lib$(DIR).a)
GALLIUM_WINSYS_DIRS = xlib egl_xlib