Can not install geant4 and root_base packages simultaneously

[tkittel]

Solution to issue cannot be found in the documentation.

• I checked the documentation.

Issue

Trying to install both geant4 and root_base packages results in a dependency conflict. This is unfortunate, as I was hoping to be able to produce easy instructions for me colleagues concerning how to deploy both Geant4 and ROOT in the same conda environment (in order to build garfield++).

I am not 100% sure, but the conflict might be caused by the krb5 dependency, dragged in through xrootd. Or at least, that was one Issue I managed to track down, but there might be others.

Personally, I would love it if there was a an alternative root_minimal package (mimicking -Dminimal=ON), since the number of dependencies of a full-blown root package is rather sizeable. I am investigating providing my colleagues with a custom conda package recipe for such a minimal package, but it would of course be preferable if it was made available from the real experts :-)

Cheers,
Thomas

Installed packages

geant4 / root_base (but obviously I didn't manage)

Environment info

conda version : 23.7.2
    conda-build version : 3.26.0
         python version : 3.9.17.final.0
       virtual packages : __archspec=1=x86_64
                          __glibc=2.31=0
                          __linux=5.4.0=0
                          __unix=0=0
       base environment : /some/where/miniforge_install/miniforge_installed  (writable)
      conda av data dir : /some/where/miniforge_install/miniforge_installed/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
          package cache : /some/where/miniforge_install/miniforge_installed/pkgs
                          $HOME/.conda/pkgs
       envs directories : /some/where/miniforge_install/miniforge_installed/envs
                          $HOME/.conda/envs
               platform : linux-64
             user-agent : conda/23.7.2 requests/2.31.0 CPython/3.9.17 Linux/5.4.0-155-generic ubuntu/20.04.6 glibc/2.31
                UID:GID : 1001:1001
             netrc file : None
           offline mode : False

[tkittel]

Actually, scratch that last remark about root-minimal. Even e.g. garfield needs one or two specific components enabled, so that obviously won't work then. However, it would be great if there was a root_reallybase without the most potentially troublesome components (those which pin dependencies to non-standard values like llvm/clang/cling and apparently also xrootd).