Unresolved symbol in libQt6WebEngineCore.so.6.4.2

Hi,

a build with non-standard port options (mostly nox11 und related stuff  
for a headless system, except for some ports where this doesn't work)  
is giving me an unresolved symbol in libQt6WebEngineCore.so.6.4.2.  
This symbol is _ZN7sandbox6policy12SandboxLinux11GetInstanceEv.

I'm seeking some insight where this symbol comes from, so it would be  
nice if someone could report back if their  
libQt6WebEngineCore.so.6.4.2 also has this symbol as unresolved and  
which libary does provide this symbol via:
   find /usr/local/lib -type f -print0 | xargs -0 nm -dynamic  
--print-file-name | grep SandboxLinux

Thanks,
Alexander.

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