I'm guessing your GTK was build with a similar PNG library that FLTK has, and therefore isn't crashing.
On my system, the system PNG libs seem to be:
[erco@harris] 250 # ls -la /lib64/*png*
lrwxrwxrwx. 1 root root 11 Jun 5 2018 /lib64/libpng.so -> libpng15.so
lrwxrwxrwx. 1 root root 16 Jun 5 2018 /lib64/libpng.so.3 -> libpng.so.3.50.0
-rwxr-xr-x. 1 root root 175256 Nov 4 2016 /lib64/libpng.so.3.50.0
lrwxrwxrwx. 1 root root 18 Jun 5 2018 /lib64/libpng12.so.0 -> libpng12.so.0.50.0
-rwxr-xr-x. 1 root root 162400 Nov 4 2016 /lib64/libpng12.so.0.50.0
lrwxrwxrwx. 1 root root 19 Jun 5 2018 /lib64/libpng15.so -> libpng15.so.15.13.0
lrwxrwxrwx. 1 root root 19 Jun 5 2018 /lib64/libpng15.so.15 -> libpng15.so.15.13.0
-rwxr-xr-x. 1 root root 179296 Dec 9 2015 /lib64/libpng15.so.15.13.0
..and the one inside FLTK is: libpng version 1.6.37 - April 14, 2019
I'm not sure which one of the above GTK was built against, but I'm guessing it's the 15 (1.5?) version, based on this:
[erco@harris] 256 # ls -lad libgtk-*
lrwxrwxrwx. 1 root root 21 Nov 27 2018 libgtk-3.so -> libgtk-3.so.0.2200.30
lrwxrwxrwx. 1 root root 21 Nov 27 2018 libgtk-3.so.0 -> libgtk-3.so.0.2200.30
-rwxr-xr-x. 1 root root 7458680 Oct 31 2018 libgtk-3.so.0.2200.30
lrwxrwxrwx. 1 root root 23 Jun 5 2018 libgtk-vnc-2.0.so.0 -> libgtk-vnc-2.0.so.0.0.2
-rwxr-xr-x. 1 root root 70952 Apr 12 2018 libgtk-vnc-2.0.so.0.0.2
lrwxrwxrwx. 1 root root 27 Jun 5 2018 libgtk-x11-2.0.so -> libgtk-x11-2.0.so.0.2400.31
lrwxrwxrwx. 1 root root 27 Jun 5 2018 libgtk-x11-2.0.so.0 -> libgtk-x11-2.0.so.0.2400.31
-rwxr-xr-x. 1 root root 4817936 Aug 2 2017 libgtk-x11-2.0.so.0.2400.31
Thu 05/27/21 08:55:57 /usr/lib64
[erco@harris] 257 # ldd libgtk-vnc-2.0.so.0.0.2 | grep png
libpng15.so.15 => /lib64/libpng15.so.15 (0x00007fbe56732000)
I'm on Sci Linux 7, which is old because they stopped continuing releases, so until I upgrade to a newer workstation (dread), I'm stuck in 2018, lol. But a good test considering many customers are running older OS's.
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