make auto_config is implied when running make all.

Makefile

@@ -59,7 +59,7 @@ help:
 	@echo -e "\tmake tags\t\t- generate tag files for source code"
 	@echo " "
 
-all:
+all:    config.mk
 	set -e; for d in $(DIRS); do $(MAKE) -C $$d ; done
 
 mrproper: clean
@@ -78,7 +78,7 @@ install:
 	find . -name .depend -exec rm {} \;
 	set -e; for d in $(DIRS); do $(MAKE) -C $$d install ; done
 
-auto_config:
+auto_config config.mk:
 	@touch config.mk config.new
 	@rm -f config.mk config.new
 	@./Configure -d