@wpoely86: the usefulness of this old CP2K easyconfig is pretty low, that's true, but I'll merge it anyway (since the build works). I'll the Bison dep as is; bumping it shouldn't be a problem indeed, but then I'd need to bump it in the other same-version CP2K easyconfigs, which I'd like to stay away from (what if someone is building this old version of CP2K on a system where building `Bison/2.5` worked, but building `Bison/2.7` doesn't, we don't want to break that use case).