[Damn, it happened again. This message sat in the editor and I forgot to post it.
Sorry for duplicating some of your stuff. Here's for completeness what I wrote hours ago ...]

You can also check an application with ldd and you'll see which one is linked.

FTR: this is not true for FLTK applications because we link libgtk dynamically to test if it's available.

The libgtk versions we're looking for are libgtk-3 (GTK-3) and libgtk-x11-2.0 (GTK-2), in this order. For both shared libs we're appending '.so.n' with n = {2, 1, 0} - again in this order (per library), i.e. we prefer GTK-3 and fall back to GTK-2 if GTK-3 is not found. In your case this algorithm should find the symlink libgtk-3.so -> libgtk-3.so.0.2200.30.

[newly added text]

Looks like you are using libpng 1.5 then. I'll try one of my docker images with older systems if I can reproduce this ...

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