Type
stty erase ^V(That is CTRL-V followed by the backspace key)
Add this to ~/.vimrc
:set t_kb=^V(That is CTRL-V followed by the backspace key):fixdel
(Not sure this works - not verified)
Add this line to ~/.Xresources*ttyModes: erase ^V(That is CTRL-V followed by the backspace key)