Re: XITE license

[Richard Stallman]

    I realize it is a BSD license

Actually it is not a BSD license, it is an X11 license.
The BSD license has an obnoxious advertising clause
which this license, fortunately, does not have.
See http://www.gnu.org/philosophy/bsd.html for more
about this side issue.

This license looks compatible with the GPL to me.
So you can use the code with its current license.