Description:
------------
Building failed becase of undeclared identifier

Reproduce code:
---------------
diff php_pdo_mysql_int.h php_pdo_mysql_int.h.old
89d88
<       PDO_ATTR_EMULATE_PREPARES,


Expected result:
----------------
Building complete

Actual result:
--------------
[root@main /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql]# make
/usr/local/bin/bash /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/libtool --mode=compile gcc -I/usr/local/include/php/ext -I/usr/local/include/mysql -fno-strict-aliasing -pipe   -fno-omit-frame-pointer -fno-gcse -I. -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -DPHP_ATOM_INC -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/include -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/main -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext  -DHAVE_CONFIG_H  -g -O2   -c /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/pdo_mysql.c -o pdo_mysql.lo
mkdir .libs
 gcc -I/usr/local/include/php/ext -I/usr/local/include/mysql -fno-strict-aliasing -pipe -fno-omit-frame-pointer -fno-gcse -I. -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -DPHP_ATOM_INC -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/include -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/main -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -DHAVE_CONFIG_H -g -O2 -c /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/pdo_mysql.c  -fPIC -DPIC -o .libs/pdo_mysql.o
/usr/local/bin/bash /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/libtool --mode=compile gcc -I/usr/local/include/php/ext -I/usr/local/include/mysql -fno-strict-aliasing -pipe   -fno-omit-frame-pointer -fno-gcse -I. -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -DPHP_ATOM_INC -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/include -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/main -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext  -DHAVE_CONFIG_H  -g -O2   -c /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c -o mysql_driver.lo
 gcc -I/usr/local/include/php/ext -I/usr/local/include/mysql -fno-strict-aliasing -pipe -fno-omit-frame-pointer -fno-gcse -I. -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -DPHP_ATOM_INC -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/include -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/main -I/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -DHAVE_CONFIG_H -g -O2 -c /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c  -fPIC -DPIC -o .libs/mysql_driver.o
/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c: In function `pdo_mysql_set_attribute':
/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c:322: error: `PDO_ATTR_EMULATE_PREPARES' undeclared (first use in this function)
/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c:322: error: (Each undeclared identifier is reported only once
/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c:322: error: for each function it appears in.)
/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c: In function `pdo_mysql_handle_factory':
/usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql/mysql_driver.c:469: error: `PDO_ATTR_EMULATE_PREPARES' undeclared (first use in this function)
*** Error code 1

Stop in /usr/ports/lang/php5/work/php-5.1.4/ext/pdo_mysql.