[jakejake]

I think it is polite to communicate with the original author first. They may appreciate having somebody else in charge of package management.

It's not uncommon for an app author to provide only source code and then some other person decides to build and maintain binaries for a few systems. That's been happening for years. The author doesn't want to deal with various systems and compilers, but some other person takes an interest. Putting a lib in a package manager system seems somewhat similar.

Basically I think just communicating with the author is the best policy. And if you submit it - plan to keep it updated.