Help with pydb mode? (improved python debugger)

I'm interested in pydb mode (improved python debugger). Unfortunately, it doesn't quite work with xemacs's ancient gud. Can anyone help? First it complained about gud-prompt-cmdline begin missing. I compared the code to pdb.el, and replace it with this: (list (read-shell-command "Run pdb (like this): " (if (consp gud-pdb-history) (car gud-pdb-history) "pdb ") '(gud-pdb-history . 1)))) The next problem is (gud-common-init command-line 'gud-pydb-massage-args 'gud-pydb-marker-filter 'gud-pydb-find-file) gud-common-init is called with 4 param, but only takes 2. I'm guessing this is a more serious problem.