We have a dummy autogen.sh that just points the user to INSTALL.BZR, but
that file doesn't tell the user how he would actually regenerate the
configuration scripts the way autogen.sh does for most projects.

=== modified file 'INSTALL.BZR'
--- INSTALL.BZR	2011-01-02 23:50:46 +0000
+++ INSTALL.BZR	2011-02-27 05:08:49 +0000
@@ -10,6 +10,9 @@

   $ ./configure

+If you have actually modified the autoconfiguration scripts, a run of
+autoreconf(1) will regenerate the necessary files.  You need not
+execute this command if you have not modified the autoconfiguration
+files.
+
 Some of the files that are included in the Emacs tarball, such as
 byte-compiled Lisp files, are not stored in Bazaar.  Therefore, to
 build from Bazaar you must run "make bootstrap" instead of just "make":