Lumina and env variables

[Grzegorz Junka]

Hello,
Does anyone know how to set an environment variable so that it's visible 
when running Lumina applications? Currently I have QT_QPA_PLATFORMTHEME 
set in .profile and .cshrc but these are not visible when I run qt5ct 
from the Lumina launch menu. They only take effect when I run qt5ct from 
the command line (Konsole).

This is quite strange because I start Lumina with startx and my .xinitrc 
looks like this

exec /usr/local/bin/start-lumina-desktop

I would have hoped that these environment variables should be inherited 
by the Lumina process and subsequently by all applications launched from 
the menu. Unless something overwrites them later?

Thanks
GrzegorzJ