2.10. Uninstalling all Software Collection directories reads:

> Keep in mind that the yum remove command does not uninstall directories
> provided by those Software Collection packages and subpackages that are
> removed after the Software Collection runtime subpackage is removed.
>
That could be true. However this sounds like a bug in yum/rpm.

> To ensure that all directories are uninstalled, make those packages and
> subpackages depend on the runtime subpackage.

Well, to use any package from a collection, one has to enable the collection first. So any collection package must transitively require the runtime subpackage.

> To do so, add the following
> line to the spec file of each of those packages and subpackages:

> %{?scl:Requires: %{scl}-runtime}

Therefore I consider adding the explicit dependency to only _some_ packages as false.

> Adding the above line ensures that all directories provided by those packages
> and subpackages are removed correctly as long as the runtime subpackage does
> not depend on any of those packages and subpackages.

Moreover I was told that yum/rpm does not work like that and that the explicit dependency does not help.