create a dummy config.mk when running just `make`
diff --git a/Makefile b/Makefile
index 2b31891..9f9668e 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@
-include config.mk
VPATH += include m4
-all: config.h libltp.a
+all: config.h config.mk libltp.a
@$(MAKE) -C pan $@
@$(MAKE) -C testcases $@
@$(MAKE) -C tools $@
@@ -100,6 +100,8 @@
touch include/$@
config.h: config.h.default
cp include/config.h.default include/config.h
+config.mk:
+ touch $@
.PHONY: automake
AUTOMAKE_FILES = config.guess config.sub install-sh missing