
Recommend the use of `on_macos` and `on_linux` unless we're in `def install`, `def post_install` or `test do` in which case recommend `OS.mac?` and `OS.linux?` instead.
Recommend the use of `on_macos` and `on_linux` unless we're in `def install`, `def post_install` or `test do` in which case recommend `OS.mac?` and `OS.linux?` instead.