Comment 19 for bug 297428

@ Bogdan: Yes, I apply the patch manually. I don't know how to apply it at updates automatically, but you could check on every system start with this line in /etc/rc.local:
if [ "`grep \<name\>your-custom-layout\</name\> /usr/share/X11/xkb/rules/evdev.xml`" == "" ]; then patch /usr/share/X11/xkb/rules/evdev.xml < /path/to/your/patch; fi;