Opera developer build 46.2602 now requires GKT-3, while any of the previous builds (I was using 46.2556) was perfectly happy to work with just GTK-2 libraries. This new, higher requirement cuts off from using Opera all Linux distros that don't include native GTK-3. Those are mostly the minimalistic distros -- minimalistic not in the sense of "very few users" but rather of "low system resources needed".
Is there a possibility to go back to requiring just GTK-2 in a future build?
objdump -p opera-developer 46.2556 vs 46.2602 diff
2556 NEEDED libgtk-x11-2.0.so.0
2556 NEEDED libgdk-x11-2.0.so.0
2602 NEEDED libcairo.so.2
2602 NEEDED libgtk-3.so.0
2602 NEEDED libgdk-3.so.0
Opera couldn't start even when I installed GTK-3 and GTK-2 libraries side-by-side. Running from a shell prompt:
(opera-developer:21217): Gtk-ERROR **: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
The bottom-line: the last developer build before 46.2602 is the end of the line for low-in-system-demand Linux distros that are based on GTK-2, such as Puppy Linux, that is unless Opera devs remove the on GTK-3 that they introduced in build 46.2602.
Above information submitted as DNAWIZ-16093.
I believe the correct tracker reference is DNAWIZ-61093.