Let us specify e.g. --with-dune=/usr, so that the _ROOT variable is set to e.g. /usr/dune-common, but then backtrack to the parent directory again if we don't find anything there and search directly in suite dir.
Let us specify e.g. --with-dune=/usr, so that the _ROOT variable is set to e.g. /usr/dune-common, but then backtrack to the parent directory again if we don't find anything there and search directly in suite dir.