rxvt: backspace won't work?

[Zhang Weiwu]

Hello. I just have rxvt installed and working.

The problem now is that when I am in vi, in the input mode (press 'a' or 
'i' to enter input mode), if I press the backspace, a '\?' is resulted 
instead of deleting the character befor cursor. This also happens when I 
use less(3), when I search something with '/' the searched text cannot 
be backspace-deleted.

In the meantime xterm works fine, everything behavior just like in the 
real console.

Did I missed some thing in Xresource?

Thank you. I am running fluxbox/FreeBSD 5.1 on thinkpad 600XD.