[Level2] Pass parameters to make.
$ cat Makefile all: ifdef aa echo "defined" ifeq "${aa}" "123" echo "true" else echo "false" endif else echo "not defined" endif $ $ make echo "not defined" not defined $ $ make aa="000" echo "defined" defined echo "false" false $ $ make aa="123" echo "defined" defined echo "true" true $ Wish this helps. regards, Stanley Huang