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  1. ROOT
  2. ROOT-9145

Cannot use pyROOT from a conda python installation

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Details

    • Bug
    • Status: Closed (View Workflow)
    • High
    • Resolution: Clarified
    • master
    • None
    • PyROOT
    • None
    • debian 9.2, probably others ( I don't expect this to be linux-flavour specific)

    Description

      No matter how hard I try, I cannot import ROOT from a conda installation of python.
      Given the widespread use of conda as a python package manager, I think ROOT should have a working formula that allow users to use conda and pyROOT together.

      Configuring CMake with
      cmake -DPYTHON_EXECUTABLE=/home/eguiraud/Tools/miniconda2/bin/python path/to/root
      and then building, this is what I get at python prompt:

      $ source $ROOTSYS/bin/thisroot.sh
      $ python
      >>> import ROOT
      Traceback (most recent call last):
        File "<stdin>", line 1, in <module>
        File "/home/eguiraud/ROOT/root_build/lib/ROOT.py", line 24, in <module>
          import cppyy
        File "/home/eguiraud/ROOT/root_build/lib/cppyy.py", line 61, in <module>
          import libPyROOT as _backend
      ImportError: /home/eguiraud/Tools/miniconda2/lib/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/eguiraud/ROOT/root_build/lib/libPyROOT.so)

      It was suggested I should not source thisroot.sh (which is weird since most ROOT users just do it in their bashrc or anyway when they setup their working environment) and just export PYTHONPATH=$ROOTSYS/lib, but this yields similar results.

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            axel Axel Naumann
            eguiraud Enrico Guiraud
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              Created:
              Updated:
              Resolved: