PyROOT cannot open file: "Error in <TNetXNGFile::Open>: [FATAL] Auth failed"

[ksmith]

@mwilkins

However, that one flag alone is not enough. I had to do:

cmake -Dall=On -DPYTHON_EXECUTABLE=/usr/local/bin/python2 -DPYTHON_INCLUDE_DIR=/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/Headers -DPYTHON_LIBRARY=/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib ../root/ 

pointing it at the Homebrew version of python.

Thanks for doing the leg work on this. In addition to assisting those who want to use non-default python versions this is also needed for python3 installations when python2 is the default. I was going to update the other topic, but it is locked. So the best I can do is link it here and hope that it is seen by others with this issue:

How to properly install PyROOT for Python 3?

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

@mwilkins

I think I’d prefer the Anaconda version (if only so I can type python instead of python2 at the prompt), so I have to track down its include dir and libraries for the flags, but I have a function version of ROOT now. Thanks again for all your help.

You can always create an alias that points to the python2 version:

alias python=python2

[mwilkins]

Credit to my colleague for pointing out the solution to me.

Yeah, I’ll probably just alias it rather than spend more time working it out.

Thanks again.

[amadio]

Just for the record, if you are using anaconda and relying on LD_LIBRARY_PATH and the like, when you source $ROOTSYS/bin/thisroot.sh, that changes LD_LIBRARY_PATH, which may make anaconda software start to use libraries from a different place, e.g. system libraries instead of anaconda libraries. One solution might be to put directories in the right order by hand. I would try with anaconda directories first, then ROOT’s directories, then the system ones. That way anaconda’s python won’t break due to usage of system libraries.