supply

type Manifest interface {
	DefaultVersion(string) (libbuildpack.Dependency, error)
	InstallDependency(libbuildpack.Dependency, string) error
}

type Stager interface {
	AddBinDependencyLink(string, string) error
	DepDir() string
}

type Supplier struct {
	Stager   Stager
	Manifest Manifest
	Log      *libbuildpack.Logger
}