*That sorted it, and my copy of -gretl- 2017b-git is now running, with PDF viewer successfully switched to xreader. * *My TeXLive 2016 installation log (from one of Purdue's servers last week) shows no package entry for -functex-, so that may have something to do it. Or it may have been, as you suggest, missing some other dependency.* *Either way, many grateful thanks for your quick help and for zoning in so quickly on the issue.* *C* -- Clive Nicholas "My colleagues in the social sciences talk a great deal about methodology. I prefer to call it style." -- Freeman J. Dyson