dub + local dependencies

[Jolly James via Digitalmars-d-learn]

WARNING: A deprecated branch based version specification is 
used for the dependency xyz.
Please use numbered versions instead.
Also note that you can still use the dub.selections.json file 
to override a certain dependency to use a branch instead.


The problem is: xyz is a local package and therefor I don't know 
how to specify its version. So in the dub.json of the package abc 
requiring xyz is written:


        "dependencies": {
                "xyz": "~master"
        },


Is there a cleaner solution?