-boot.stage.%: $(PRIMOP_BITS) $(CONFIG_HS) parser/Parser.y
- test -e $(STAGE3_PACKAGE_CONF) || echo "[]" > $(STAGE3_PACKAGE_CONF)
+# In a source dist we don't need to worry about Parser.y(.pp) as we have
+# the .hs file pre-generated
+ifneq "$(wildcard parser/Parser.y.pp)" ""
+PARSER_Y = parser/Parser.y
+endif
+
+boot.stage.%: $(PRIMOP_BITS) $(CONFIG_HS) $(PARSER_Y)
+ test -f $(STAGE3_PACKAGE_CONF) || echo "[]" > $(STAGE3_PACKAGE_CONF)