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From: Javier <nospam@nospam.com>
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Subject: Re: Using AltGr as standard modifier key in emacs
Date: Tue, 13 Oct 2015 18:43:39 +0000 (UTC)
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> Typing this in a terminal should do the trick
> 
> xmodmap -e "keycode 108 = Hyper_L" ; xmodmap -e  "add mod4 = Hyper_L"
> 

Oops, it turns out to remap rightAlt the sequence is

xmodmap -e "clear mod1" ; xmodmap -e "add mod1 = Alt_L Meta_L" ; xmodmap -e "keycode 108 = Hyper_R" ; xmodmap -e "add mod3 = Hyper_R"

http://stackoverflow.com/questions/28527938/xkb-configuration-for-emacs

I assumed keycode 108 is the keycode for right alt, which should
be ok for a modern pc-keyboard.  You can check the keycode number with xev.