As other folks said, you are missing libncurses5-dev. Actually to save
yourself a bunch of little issues with what Configure finds on your
machine just do "sudo apt-get build-deps xemacs21" to get all the build
requires for the old version and that should get you fairly far towards
building the beta version. (Geez, I can't believe there is a ppa
somewhere for xemacs-beta.)
--
Jeff Baird <Jeff_Baird(a)cs.cmu.edu>
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