The thread [url]Problems installing root with --prefix=$HOME/.local seems to suggest that if one first defines ROOTSYS and then configures ROOT using “–prefix” then one gets a screwed installation.
I didn’t try it myself, but if this is really the case, then one should add an explicit warning (in big letters) in http://root.cern.ch/drupal/content/installing-root-source
And if you mention ROOTSYS there, maybe you could also add my notes from [url]Installing ROOT from Source
Well using ${ROOTSYS} in --prefix= causes a problem, not having ROOTSYS defined per se.
Cheers, Fons.