When trying to run make, I get the following messages:
*******
Making install in main
gcc  -I. -I/home/php4-200103120945/main -I/home/php4-200103120945/main -I/home/o
In file included from php_compat.h:7,
                 from php.h:35,
                 from main.c:26:
php_config.h:1783: warning: `ZEND_DEBUG' redefined
/home/apache_1.3.12/src/include/../php_config.h:1606: warning: this is the locan
php_config.h:1813: warning: `PHP_BUILD_DATE' redefined
/home/apache_1.3.12/src/include/../php_config.h:1636: warning: this is the locan
In file included from php_compat.h:7,
                 from php.h:35,
                 from main.c:26:
php_config.h:1864: warning: `zend_isinf' redefined
/home/apache_1.3.12/src/include/../php_config.h:1681: warning: this is the locan
main.c: In function `php_module_startup':
main.c:790: structure has no member named `get_configuration_directive'
main.c: In function `php_execute_script':
main.c:1153: structure has no member named `exit_status'
main.c:1164: structure has no member named `exit_status'
main.c:1203: structure has no member named `exit_status'
*** Error code 1
make: Fatal error: Command failed for target `main.lo'
Current working directory /home/php4-200103120945/main
*** Error code 1
make: Fatal error: Command failed for target `install-recursive'
Current working directory /home/php4-200103120945/main
*** Error code 1
make: Fatal error: Command failed for target `install-recursive'
*****

This is after I run ./configure --with-informix=yes --with-apache=../apache_1.3.12 --enable-track-vars with 
no problems.

This is a exisiting server that already has apache 1.3.12 with php4.0.2 running.