It's not directly a issue in XnViewMp but i can't lunch the new version of XnviewMP (0.75) :
error while loading shared libraries: libQt5MultimediaWidgets.so.5: cannot open shared object file: No such file or directory
Since i follow the MP version i was see this kind of issue

I'm using a Gentoo & i have try to install the dev-qt/qtmultimedia but it's help
A quick search on google about libQt5MultimediaWidgets.so.5 say it's on the libQt5Multimedia but i don't have this kind of package
Do you known wich dependenci it's needed ?
Thanks in advance