apt-get build-deps <package> or -b switch

[Harry Putnam <reader@newsguy.com>]

How can I capture the output of ./configure and make during a source
build with apt-get -b source <package>

I think there might be a small bug in the building of emacs21 that
way.  The info flew by so quick but I noticed a `no' during
./configure that I think was prompted by a missing library
`libungif4-dev'.

I think that was supposed to be grabbed with 
  apt-get build-deps emacs21
But it wasn't maybe.  I'd like to rerun the ./configure  and trace it
down.