New comment by Goorzhel on void-packages repository https://github.com/void-linux/void-packages/pull/38816#issuecomment-1257109375 Comment: I tried [six different environments](https://groups.io/g/linuxham/topic/93843043) — {{Void,FreeBSD} laptop,NixOS VM} plus {sway,i3} — and the fltk test programs displayed correctly only on the NixOS VM, in both X and Wayland. I wanted to figure out what NixOS was doing differently, but I went about it in a very caveman-like way: I went back to the Void system and tried compiling with each dependency I figured I was missing, one-by-one: ``` $ xi -y libXft-devel $ ./configure && make -j8 && test/preferences && make clean $ # and so on, for libX{inerama,cursor,fixes,...} ``` But I couldn't get the all-black UI to go away. I also tried `./configure --enable-local{jpeg,zlib,png}` — same behavior. There is almost certainly something very stupid I'm missing. But I'll devote some more time to finding it before asking [up-upstream](https://www.fltk.org/).