Hello, I became aware of the official release of Tcl/Tk 8.5 in the other thread. I tried to upgrade but failed as already reported by Stephen. The ports for Tcl/Tk require some work to be stable. <http://trac.macosforge.org/projects/macports/ticket/13682> I wanted to upgrade Tcl/Tk to see if it works with PLplot and Tcl-nap. In the mean time, Ryan found PLplot does not work with Tcl/Tk 8.5 (Thanks!). This upgrade of Tcl/Tk affects other ports significantly. <http://trac.macosforge.org/projects/macports/ticket/13697> It occurred to me if we could separate Tcl/Tk 8.4.x and Tcl/Tk 8.5 ports as done with Python. Then PLplot can depend on port:tcl84 and port:tk84. Any opinions? Takeshi