Comment 20 for bug 9364

Martijn:
I agree that having deadkeys is a pain when coding. That is why is switch
between keyboard layouts.
If you don't want to change layout, you can still try adding the line to the
file /etc/X11/xkb/symbols/pc/us in the xkb_symbols "basic" section (line 47 if I
have the same version as you do).
Reload (`setkbmap us`) and then RightAlt+j should work.

RightAlt does not do anything special right now simply because no combination is
using it in the US/ASCII keymap you are using.