Interoperability of virtualenv setup with Spack
You might have seen that I messed around with master earlier. This issue is first and foremost to apologize for that. I am packaging Dune for Spack and it is super difficult and time consuming to debug the arising problems, so I was a bit hasty on pushing things to master to actually test them. I removed my experiments with a forced push.
The problem is that in Spack everything is installed and we need to make sure that our virtualenv setup works with installed modules. Also, the only way to communicate information around is environment variables.
It seems like I need to solve the underlying problem in dune-common. But there of course, people might oppose it much more...