Throw in comment so that one doesn't get tempted to optimize it away.
diff --git a/crypto/Makefile b/crypto/Makefile
index 6c9159f..c7f1c29 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -94,9 +94,9 @@
 	@$(PERL) $(TOP)/util/mklink.pl ../apps $(APPS)
 	@target=links; $(RECURSIVE_MAKE)
 
+# lib: $(LIB): are splitted to avoid end-less loop
 lib:	$(LIB)
 	@touch lib
-
 $(LIB):	$(LIBOBJ)
 	$(AR) $(LIB) $(LIBOBJ)
 	$(RANLIB) $(LIB) || echo Never mind.