> Maybe the command line option "--warn-undefined-variables" > already does what you want. That's the kind of sugguestion that might be what I want - but alas, it is only a warning (I see no option that makes it an error), and hence does not stop make's interpretation of the rest of the file - which I would like to avoid. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist