Dependency for a specific target.

[proper void]

The not goes inside

https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#platform-specific-dependencies and you will want to use the cfg() form

[proper void]

Try moving it to not(all(...))

You should have had a any instead of a all. Because of boolean algebra

Moving a not inside a and makes it a or

For windows x64 it would be all(not(true), not(false)) which is false