I get the last gettext and configuring/compiling/installing fine with:
./configure --prefix=/usr --disable-nls

After I tried to configure PHP 4.0.6 (after 4.0CVS and it was the same result) with this command line:
./configure --with-imap --with-mysql  --with-apxs=/usr/local/apache/bin/apxs --with-openssl --with-zlib --enable-ctype --enable-ftp --with-gd --enable-sockets --enable-sysvsem --enable-sysvshm --enable-memory-limit --with-png-dir=/usr/lib --with-gettext

The error reproduces even if write --with-gettext=/usr

My conf:
buildconf: autoconf version 2.13 (ok)
buildconf: automake version 1.4 (ok)
buildconf: libtool version 1.4.1 (ok)

I was really disapointed with this problem and all my research were without any solutions.

Best Regards,
Xavier O.