New comment by arp242 on void-packages repository

https://github.com/void-linux/void-packages/issues/17891#issuecomment-571682332

Comment:
It works for me; I do have this in my zshrc:

    export GTK_IM_MODULE=xim         # Make compose key work
    export QT_IM_MODULE=xim

I forgot the exact details as I added this years ago, but I think I added it to fix it in Firefox.