Hi
How can one retrieve TPythia and associated includes and libraries with the homebrew distribution?
I use cmake to build root applications and libraries.
Thanks
Claude
Root version 6.22/06
Mac OS 11.2.3
Hi @cpruneau ,
the homebrew formula is not maintained by the ROOT team but by helpful contributors from the community. Maybe @henryiii has an idea or knows who does 
Cheers,
Enrico
OK Thanks
If you can use them separately, then there shouldn’t be a problem, you can build Pythia then include it - I do that at least one place somewhere. If you want the built-in Pythia support flag for ROOT, that would require recompiling ROOT and adding a Pythia formula to Homebrew. The easiest way to get it would likely be to use Conda and conda-forge instead, where we explicitly do provide Pythia support, IIRC (I remember there being a little chicken-and-egg problem, because Pythia can include ROOT and ROOT can include Pythia).
1 Like
Thanks – I will try Conda then.
Okay, great. Here’s proof we do include it: root-feedstock/build_root-base.sh at 093cd1cbee2ab8fd7fab62ea5d6bd79b5789c9c8 · conda-forge/root-feedstock · GitHub
Thanks for indirectly reminding me I needed to bump ROOT in homebrew to 6.22.08. I’ve been trying to wait till it shows up on root.cern since at least one patch was “pulled” after the GitHub release (which I follow) but before the root.cern publishing (which I assume there is not an RSS feed or simliar for following).
I think there is a mailing list for official release announcements (it’s true that the git tag is not as official as the official announcement) – @Axel ?
For major releases you can follow the RSS feed of https://root.cern but a) you’ll get blog posts mixed in (might be a plus) and b) I am not sure patch releases will appear.
Hi
Thanks for answering.
Sorry to be dense… but I do not find it under /usr/loca/lCellar/root where Homebrew has installed root and dependencies. I am able to use root stand alone and do all kinds of good stuff, but I wish to integrate TPythia8. I managed to do this a while back but Apple keeps changing everything… argh.
Claude
Are you specifically looking for the integration (which just adds a ROOTified class, TPythia, IIRC)? Otherwise, it should be simple to just download Pythia, build (it should find ROOT at /usr/local), and then include wherever you install Pythia too (/opt/pythia8 is where I tend to put it), and it should be fine. You just don’t get the ROOTified Pythia class, but all the normal stuff works fine.
I have PYTHIA installed and I can run it stand alone fine. But I prefer integrating it in root via the TPYHIA calls – this way I can run PYTHIA event generation and analyze the events on the fly with my own root classes in a root executable that I build myself using cmake.
Well, if you want to use homebrew, you would need to add a Pythia8 formula, get that merged, and then update the ROOT formula to use it. It’s doable, I even started it just to see what would be required, but would need a little bit of work that would be best done with someone who uses Pythia more regularly than me or a contributor (I could bug someone like Philip Ilten, I suppose). Specifically: what options would be best to enable, what’s the best way to test it (I check importability from Python in conda-forge), and what dependencies should it have. It also hopefully supports M1’s, because I’m currently updating the ROOT formula for Apple Silicon.
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