If you are following unstable and are using PAM, and more specifically the pam-apps package. I highly suggest that you do not upgrade to xterm 3.3.3.1-3.
I repeat: do NOT upgrade to xterm 3.3.3.1-3 if you use pam-apps. The problem is that there is a rather annoying bug in the Unix98 pty support of that xterm package that completely breaks the su from the PAM suite. Please don't file a bug about this, I already did that. Wichert.
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