Exactly the same
so try Qt debug
$ export QT_DEBUG_PLUGINS=1; xnviewmp
QFactoryLoader::QFactoryLoader() checking directory path "/opt/xnviewmp/platforms" ...
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem..
then google for one with the same problem, hints to:
$ ldd /opt/xnviewmp/lib/platforms/libqxcb.so | grep "not found"
libicui18n.so.56 => not found
libicuuc.so.56 => not found
libicudata.so.56 => not found
but so weird
$ sudo pacman -S libicui18n.so
warning: icu-69.1-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...
Packages (1) icu-69.1-1
Total Installed Size: 37.92 MiB
Net Upgrade Size: 0.00 MiB
$ sudo pacman -S libicuuc.so
warning: icu-69.1-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...
Packages (1) icu-69.1-1
Total Installed Size: 37.92 MiB
Net Upgrade Size: 0.00 MiB
$ sudo pacman -S libicudata.so
warning: icu-69.1-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...
Packages (1) icu-69.1-1
Total Installed Size: 37.92 MiB
Net Upgrade Size: 0.00 MiB
A clear insight on the trouble ?