makeRule: create a make rule
In roverrobot/make: Make utility in R

create a make rule

1 2	makeRule(target, depend = c(), recipe = scriptRecipe$new(interpreter), interpreter = NULL, env = parent.frame())

`target`	a formula specifying target ~ dependences, the dependences are separated by +, or a target name (string), in which case there is no dependence.
`depend`	the dependences, if target is formula, then depend is appended to the end of the dependences specified in the formula
`recipe`	a recipe to make the target, either an R function(target, depend), or a Recipe object, or NULL (the rule makes nothing and always success, after successfully checked dependences).
`interpreter`	f using the first dependent file as a script, this is the interpreter to run the script.