Support for release 2.6
Description
Many dune modules are still depending release 2.6 of the DUNE core modules. Naturally, they will eventually come to 2.7, but in order to give these modules a chance to test this amazing facility right now, it would be nice if there were some support for release 2.6.
Proposal
Add support for dune@2.6
In an attempt to achieve this, I tried to fetch the releases/2.6
branches for a dune@2.6
version but I got an error saying that cmake
was not found. This is strange because cmake
was already on the spack spec
. This is the farther I could get with my newbie skills on spack, but if you give me some hints on how to solve this, I could keep pushing this forward