Qt5.11.3 Slackware64-current package: Strange colors

A couple of days ago, I installed Qt5 (5.11.3), using Alien Bob's Slackware packages. After I compiled and installed LibreCAD (which needed Qt5), I found that the GUI shows strange color. I also ran qt5ct, which suffered the same coloring issue. As I really don't have much experience with Qt, I have no idea where the problem could originate. Venturing a guess, could this be a font rendering problem?

I've added a screenshot of qt5ct as it appears here.

I tried to change to a light theme instead of the dark one I prefer, which made the pinkish color change to green), and tried several other variations, none of which created monochrome letters.

It looks like a bad "sub-pixel rendering" issue.
Do you have anything to configure Freetype ?

Try the GTK style instead of fusion. You might need the qt5-styleplugins package to get it.

There are only two style options: Fusion and Windows. No Gtk there... Strange.

Originally Posted by KewlCat It looks like a bad "sub-pixel rendering" issue. Do you have anything to configure Freetype ?

Mmmm... Is freetype configurable? I never modified freetype, and qt5ct doesn't seem to have any option. It's working normally under Gtk.

Originally Posted by Johncc330 There are only two style options: Fusion and Windows. No Gtk there... Strange.

The GTK style comes in the qt5-styleplugins package. It's available on SBo.