On Wed, 7 Feb 2007, Peter Davidoff wrote: I'm afraid that at present X11 is an absolute pre-requisite for using gretl on OS X. This may change at some point: there is work in progress to develop a "native" version of GTK (the GUI toolkit used by gretl) for OS X, with no X11 dependency. As soon as that becomes available in a reasonably stable form I will switch over to it. In the meantime, I'm sure there's an Apple X11 kit on the OS X Tiger installation DVD. I guess it's not installed by default, but you can plug the DVD back in and select components to add. Allin Cottrell.