Cannot access file in python "unsafe use of relative rpath"

[ksmith]

@mwilkins

$ python2
Python 2.7.14 (default, Sep 25 2017, 09:54:19) 
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.37)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from ROOT import TFile
Fatal Python error: PyThreadState_Get: no current thread
Abort trap: 6

@mwilkins

Okay so I found on this thread that python quitting is due to conflicting python versions. The same thread recommends sticking with the system build though.

This is the same error message I get from the system python, therefore I assume you build ROOT against the system python and not homebrew. You can check which python you built against with this command:

grep "/python$" root-build-dir/CMakeCache.txt

I am avoiding using the system python and building ROOT against the version provided from macports (the same can be done with homebrew). macports provides a simple method to set there version as the default in the path and I suspect something like that exists for homebrew as well. After that the build of ROOT will use the non system python by default. Alternatively, you can force CMake to use a specific version of python with the following:

cmake root-source -DPYTHON_EXECUTABLE=/usr/local/bin/python

How to properly install PyROOT for Python 3?

You can use -DPYTHON_EXECUTABLE=/path/to/desired/python without aliasing anything.