Thank you for the encouragement, Justin. Unfortunately I did try that. But it may also be where my basic understanding is missing: "the libraries" - do I have to somehow compile all the source or can I just use it? The source is Haskell, but it all comes with makefiles - are these for use with GHC or something more? I have a feeling I have to compile something somehow into some special location. I guess I'll just keep mucking around until I find a clue somewhere... All I know so far is how to use modules in Hugs which is enough for High School, but there is so much more out there... The Readme points out for the underlying Tcl: *** If on unix compile up the TclPrim.so library and run the tclexe script, with hugs as the argument program ie ../bin/tclexe hugs *** Ok, I can find tclexe, but how do I "compile up the TclPrim"? Probably pretty standard, I'm working on that (hints would still be appreciated...). I'm confused at the point where the demo imports FranTk allright, but then I've hunted the web for missing modules which left me with something else missing: Hugs> :l Demos.lhs ERROR "./Utils.hs" - Error while importing DLL "./Utils.so": dlopen(./Utils.so, 9): image not found Foreign.Marshal.Alloc> I don't begin to understand what this is telling me... If I get it to work, I'll put in on the Web for others to find. Torsten