PHP xdiff installation problems (phpize)

[mike]

I have not used 'phpize' before, but apparently it is required for
installing the PHP xdiff extension (http://pecl.php.net/package/xdiff)
in Linux. I am running PHP 4.2.2 on RH Linux 8.0 (upgrade is not
possible in production) and this is what I am getting:

$ phpize
autoheader: `config.h.in' is created
You should update your `aclocal.m4' by running aclocal.
$ ./configure
configure: error: cannot find sources (Makefile.in) in . or ..

As I understand it, phpize should generate a Makefile.in for autoconf,
but it isn't producing any errors. I imagine my problem is something
simple (perhaps my pure stupidity.) Any assistance or a pointer in the
right direction would be greatly appreciated!

[mike]

For what it's worth, I thought I just got smart by running 'go-pear' to
run the install straight through the pear command, but I run into the
same thing...

$ sudo pear install xdiff
downloading xdiff-1.2.tgz ...
Starting to download xdiff-1.2.tgz (8,215 bytes)
......done: 8,215 bytes
4 source files, building
running: phpize
autoheader: `config.h.in' is created
You should update your `aclocal.m4' by running aclocal.
libxdiff library installation dir? [autodetect] :
building in /var/tmp/pear-build-root/xdiff-1.2
running: /tmp/tmpN4QkpU/xdiff-1.2/configure --with-xdiff
configure: error: cannot find sources (Makefile.in) in
/tmp/tmpN4QkpU/xdiff-1.2 or ..
`/tmp/tmpN4QkpU/xdiff-1.2/configure --with-xdiff' failed