-$1/$2/build/%_hsc.c $1/$2/build/%_hsc.h $1/$2/build/%.hs : $1/$4/%.hsc $$(HSC2HS_INPLACE)
- $$(MKDIRHIER) $$(dir $$@)
- $$(HSC2HS_INPLACE) $$($1_$2_$3_ALL_HSC2HS_OPTS) $$< -o $$@
- touch $$(patsubst %.hsc,%_hsc.c,$$<)
+$1/$2/build/%.hs : $1/$4/%.x | $$$$(dir $$$$@)/.
+ "$$(ALEX)" $$($1_$2_$3_ALL_ALEX_OPTS) $$< -o $$@
+
+$1/$2/build/%_hsc.c $1/$2/build/%_hsc.h $1/$2/build/%.hs : $1/$4/%.hsc $$(HSC2HS_INPLACE) | $$$$(dir $$$$@)/.
+ "$$(HSC2HS_INPLACE)" $$($1_$2_$3_ALL_HSC2HS_OPTS) $$< -o $$@