After not lookng at it for I while, I tried the Gtk Spec bindings again on my Xubuntu desktop and - this time - they worked. I was able to open a new window using Spec-Gtk, the latest headless VM and the latest Pharo 9. (Many thanks to all concerned). But I've immediately hit the same issue as I've raised before with SLD support (OSWindow) - it seems impossible to open a Gtk window without the whole Pharo IDE being shown as well. If I run the following command line - ./pharo-ui Pharo.Image eval RunGtk execute I get the Pharo IDE and a GTK window opened If I run ./pharo Pharo.Image eval RunGtk execute I just get the string RunGtk returned. No window opens. I presume this will work some time in the future. Otherwise what's the use of Spec-Gtk (or OSWindow for that matter)? You might as well just use Spec on Morphic. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html