./configure --with-apache=... --with-pgsql=... --enable-track-vars --enable-versioning

gmake
...
gcc -DHAVE_CONFIG_H -I. -I/tmp/post/php-4.0.0/ext/mysql -I/tmp/post/php-4.0.0 -I /tmp/post/apache_1.3.12/src/include -I/tmp/post/apache_1.3.12/src/os/unix -I/tmp /post/php-4.0.0/Zend
-I/tmp/post/php-4.0.0 -DXML_BYTE_ORDER=12 -g -O2 -Wall -c php_mysql.c && touch php_mysql.lo
php_mysql.c:58: mysql.h: No such file or directory