I just noticed that my current Debian system does not display FL_SCREEN font any differently than FL_HELVETICA. When I was using a non-Xft version of murgaLua, I had set the fltk.font X resource to terminus, which made FL_HELVETICA monospace. That was fine for me, since I'm accustomed to seeing fixed-width fonts all the time anyway. Now using the standard version of murgaLua with scalable fonts, my X resources are ignored (understandably), but I never noticed until today that FL_SCREEN does not use a fixed-width font as I expected it would. In order to fix that, I add Fl:set_font(fltk.FL_SCREEN, "Terminus") to use my favorite fixed-width font. But this would obviously not translate to most other systems, since Terminus is not generally installed by default. I thought of replacing "Terminus" with "monospace", and it does indeed use a fixed-width font from my system (not sure which one). I'm guessing "monospace" is a pretty universal and generic font name. My question is, how universal is it? If the command Fl:set_font(fltk.FL_SCREEN, "monospace") is used on an arbitrarily chosen Win or Mac, would it guarantee a fix-width font when using FL_SCREEN?