Improvement suggestion for autoreconf.sh/INSTALL.BZR

[Óscar Fuentes]

After four months or so, updated my git checkout of Emacs, created a new
build directory and executed

myemacsbuild $ ../emacs/autoreconf

[some output elided]

Checking for autoconf (need at least version )...
unable to check
Checking for automake (need at least version 1.11)...
ok

Building Emacs from Bzr requires the following specialized programs:
autoconf (minimum version )
automake (minimum version 1.11)

[some output elided]


Ok, autoconf is not installed, so install it, rerun the script but the
check for autoconf still fails. Then tried the suggested workaround on
autoconf's output:

myemacsbuild $ autoreconf -i -I m4 ../emacs/
Can't exec "libtoolize": No such file or directory at /usr/bin/autoreconf line 
196.
Use of uninitialized value in pattern match (m//) at /usr/bin/autoreconf line 
196.

So libtool is required, but no mention to that fact on
INSTALL.BZR. Installed it and tried again:

myemacsbuild $ autoreconf -i -I m4 ../emacs/
myemacsbuild $ _

Good, the configure script was created in the source directory.

So something is fishy with the detection of autoconf and it would be
good to report the absence/requirement of libtool from the script and/or
INSTALL.BZR.

I'm using Kubuntu 12.04 64 bits.

Thanks.