[Shadonototra]

build.rs is the way to go, configuration withing configuration files is the root for evils like XML scripting in msbuild

[pkolaczk]

The best way is to keep scripting out of build files. Build recipes must be simple, boring, reliable, and same everywhere.

Gradle and SBT allow unlimited scripting and builds often end up as an unreliable mess. The more cleverness they put into the build definition, the more frustrating it is to use in practice.

[Shadonototra]

that's a very good and solid point!