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Oh my GOD!!! A new post. I nearly gave up hope that this will ever happen again. But as my longing to install ROOT on SL 5.5 in a VM via the package manager yum for testing purposes of some programme which needed an equal system for, as said, debugging reasons, grew into a not that time consuming but nevertheless not too short horrible nightmare, I decided to write down the very much too easy solution.

As a repository consisting ROOT is not provided by SL 5.5 as a standard option (only Higgs knows why), one has to add one to the list. Why did I believe that there was one, to begin with? I first tried SLC 5.7 (Scientific Linux CERN), where it was no problem at all to install ROOT via yum which was, as this post is exactly about that, not the case with SL 5.5 . When I tried to install ROOT by bashing into the commandline “yum install root” nothing was found. Hmmm … I decided to ask google in which repository I can find ROOT as a package for Red Hat. No answer at all. I didn’t believe that so I spent some time asking google again … and again … to no better outcome.
After that I decided to compare the repositories of SL 5.5 to SLC 5.7 and was finally, again after some time, successful.

So here is the solution:

Just add “epel” which stands for “Extra Packages for Enterprise Linux” to your repositories. First copy the attached GPG file ( ) into /etc/pki/rpm-gpg and then, for example, open “Applications”/”Add/Remove Software” and edit the the list via “Edit”/”Repositories”. Then click “Add”, set “epel” (or what ever you like) as name and description (be careful not to have spaces in the name) and paste the URLĀ into the location field and file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL to “Advanced”/”GPG-Key”. Close the windows with “OK”, be sure that there is a mark on the new repo and also close this window via “Close”. Yum should automatically update the application list and if ROOT is searched for now it will be available for installation.

I deem all this is also doable for fresher versions of Scientific Linux with only some minor modifications.

That’s all for today.

Over and Out!

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