quacks-scads: $(addsuffix .auto.scads, $(QUACKSES))
quacks-scads: quacks-ingredients-demos.auto.scads
+quacks-stls: $(addsuffix .auto.stls, $(QUACKSES))
+
.PRECIOUS: $(SCREWRECESSTEST_DXFS) $(SCREWRECESSTEST_DXFS) \
$(foreach s,$(SCREWRECESSTEST_SIZES), \
screw-recess-test-number-s$s.fig \