define factory-zones
Factory
endef
factory-zones := $(subst $(nl), ,$(factory-zones))
ifdef factory-zones
$(addprefix $(dir $(inst_zonedir))zone%/right/,$(factory-zones)): \
factory $(objpfx)zic leapseconds yearistype
	$(tzcompile)
$(addprefix $(dir $(inst_zonedir))zone%/posix/,$(factory-zones)): \
factory $(objpfx)zic /dev/null yearistype
	$(tzcompile)
$(addprefix $(dir $(inst_zonedir))zone%/,$(factory-zones)): \
factory $(objpfx)zic $(leapseconds) yearistype
	$(tzcompile)
endif
zonenames := $(zonenames) $(factory-zones)