add orig_prog_diff and alt_prog_diff rules to Makefiles

Makefile

@@ -51,9 +51,9 @@ all:
         done
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
 
-.PHONY: all alt data everything clean clobber install \
-        love haste waste maker easter_egg sandwich \
-        supernova deep_magic magic charon pluto
+.PHONY: all alt data everything orig_prog_diff alt_prog_diff \
+	clean clobber install love haste waste maker easter_egg \
+	sandwich supernova deep_magic magic charon pluto
 
 # alternative executable
 #
@@ -91,6 +91,30 @@ everything:
         done
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
 
+# diff orig source and source
+#
+orig_prog_diff:
+	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
+	@-for i in [12][0-9][0-9][0-9]; do \
+            if [ -f $$i/Makefile ]; then \
+                echo "cd $$i; make $@"; \
+                (cd $$i; make $@); \
+            fi; \
+        done
+	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
+
+# diff alt source and source
+#
+alt_prog_diff:
+	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
+	@-for i in [12][0-9][0-9][0-9]; do \
+            if [ -f $$i/Makefile ]; then \
+                echo "cd $$i; make $@"; \
+                (cd $$i; make $@); \
+            fi; \
+        done
+	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
+
 
 ###############
 # utility rules