Description:
------------
zend_language_scanner.h not found during compilation process with latest PHP_5_1 CVS.

flex 2.5.31
gcc 3.3.5
autoconf 2.59
libtool 1.5.6

PHP 5.1.2 compiles fine with the same settings.

Reproduce code:
---------------
$ cvs -d :pserver:cvsread@cvs.php.net:/repository login
$ cvs -d :pserver:cvsread@cvs.php.net:/repository checkout -r PHP_5_1 php-src
$ cd php-src
$ ./buildconf
$ ./configure --prefix=/opt/php --sysconfdir=/etc/opt/php --sharedstatedir=/var/opt/php --disable-cgi --enable-cli
$ make



Expected result:
----------------
Everything compiles fine.

Actual result:
--------------
/bin/sh /home/project/PHP_5_1/php-src/libtool --silent --preserve-dup-deps --mode=compile gcc  -Iext/standard/ -I/home/project/PHP_5_1/php-src/ext/standard/ -DPHP_ATOM_INC -I/home/project/PHP_5_1/php-src/include -I/home/project/PHP_5_1/php-src/main -I/home/project/PHP_5_1/php-src -I/usr/include/libxml2 -I/home/project/PHP_5_1/php-src/ext/date/lib -I/home/project/PHP_5_1/php-src/TSRM -I/home/project/PHP_5_1/php-src/Zend    -I/usr/include -g -O2  -c /home/project/PHP_5_1/php-src/ext/standard/basic_functions.c -o ext/standard/basic_functions.lo 
/home/project/PHP_5_1/php-src/ext/standard/basic_functions.c:45:34: zend_language_parser.h: No such file or directory
make: *** [ext/standard/basic_functions.lo] Error 1