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Cargo (the Rust package manager) has a file that defines the package, dependencies, and such.

If Minetest used such a file, dependencies could be downloaded automatically from a GitHub link.

http://doc.rust-lang.org/book/hello-cargo.html

https://github.com/toml-lang/toml

That is the intention of mod.conf which is currently implemented in minetest. However, it is not used for anything more than setting the name of the mod.