Installation of ROOT and internet connection

I open a new topic directly related to this one because the it is now closed.
Indeed, I saw from this commit

that if gsl is not found, cmake will try to download gsl from the internet to compile it. It will be done for mathcore. As for tbb, I do not think it is a good way. I already explained my reason in the other topic and @faustus123 presented further arguments in this post.


That is a quite fair point. I will look into one of two solutions, either check if an internet connection is available
before trying to build things that need to be downloaded, or simply reverting my commit (and possibly making
TBB have similar behavior as well). The commit was added because we wanted to enable builtin_gsl on test
builds that did not have GSL installed. Thanks for reporting!

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