https://specifications.freedesktop.org/menu/latest/locations.html
Install Locations | Desktop Menu Specification
If an application is intended to be installed by root on a system wide basis then /usr/share is recommended to be used as value for datadir and /etc/xdg is...
install locationsdesktop menuspecification
https://krbdev.mit.edu/rt/Ticket/History.html?id=600
Ticket History #600: install/autoconf options not all honored in all locations
ticket historyinstallautoconf