What does ldd libgtk-3.so.0.2200.30 | grep png output?
Result is:

	libpng15.so.15 => /lib64/libpng15.so.15 (0x00007f2d29da6000)

I'd think that this is the correct libgtk.so.
You can also check an application with ldd and you'll see which one is linked.

Yes -- I looked in our fltk driver code, looks like it uses dl_open() at runtime to probe for the different versions of gtk available, starting with gtk3 first, and if not found falls back to gtk2.

Due to that, ldd won't show anything about GTK from fluid because it's not linked, but rather conditionally `dl_open()'ed at runtime by the native file chooser's call to our drivers.

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