Following what was decided for ticket #2428, I edited the UserGuide, adding a note in order to give some details about how the ExternalLibraries' location can be stripped at compilation, in case the THORN_DIR is set to BUILD or is left empty in the .cfg file. The pull request may be found in https://bitbucket.org/cactuscode/cactus/pull-requests/98/added-one-note-about-possible/diff

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2434/note-addition-in-userguide-sec-b22-about