Is there a way to remap the AltGr key to Ctrl with setxkbmap?

I've already checked the option section in "/usr/share/X11/xkb/rules/base.lst" but I didn't find an entry for AltGr...

I also tried xmodmap, however some xmodmap entries on my ~/.xsesssionrc seem to be ignored at system startup, and they don't take effect. Therefore I decided to achieve that through setxkbmap or xkb...

My keyboard layout is set to gb (on an italian keyboard).

This is what xmodmap prints:

shift       Shift_L (0x32),  Shift_R (0x3e)
lock        Caps_Lock (0x42)
control     Control_L (0x25),  Control_R (0x69)
mod1        Alt_L (0x40),  Meta_L (0xcd)
mod2        Num_Lock (0x4d)
mod4        Super_L (0x85),  Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)
mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)

And this is what xev prints when I press AltGr:

state 0x90, keycode 108 (keysym 0xfe03, ISO_Level3_Shift), same_screen YES,
    XKeysymToKeycode returns keycode: 92

Thanks for help.


Thanks to the suggestions of the Xorg community I found out the correct setxkbmap command:

setxkbmap -option ctrl:ralt_rctrl

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