Use FvwmM4 module to avoid creating env vars. Use -m4-prefix
-m4-prefix-defines options to avoid name conflict and prevent from
substitution of built-in defines (like FVWM_USERDIR).
! To load this config run:
! $ xmodmap .xmodmaprc
! Win key.
clear mod3
clear mod4
keycode 133 = Super_L
! keycode 134 = Multi_key
! keycode 134 = Super_R
keycode 134 = Hyper_R
add mod3 = Super_L
add mod4 = Hyper_R