php error with *.h files ...

Hello, I am having trouble getting my apache 1.3.12 version to work statically on my Linux box. I compiled php4 without errors, but when I recompile apache, it get the following error... Here is a php version 4 error upon compilation with Apache verions 1.3.12 on a Linux machine: ==> src/modules/standard make[4]: Nothing to be done for `all'. <=== src/modules/standard ===> src/modules/php4 gcc -c -I../../os/unix -I../../include -DLINUX=2 -DUSE_HSREGEX -DUSE_EXPAT -I../../lib/expat-lite -DNO_DL_NEEDED ../../apaci mod_php4.c mod_php4.c:28: zend.h: No such file or directory mod_php4.c:29: php.h: No such file or directory mod_php4.c:30: php_variables.h: No such file or directory mod_php4.c:31: SAPI.h: No such file or directory mod_php4.c:48: php_ini.h: No such file or directory mod_php4.c:49: php_globals.h: No such file or directory mod_php4.c:50: SAPI.h: No such file or directory mod_php4.c:51: php_main.h: No such file or directory mod_php4.c:53: zend_compile.h: No such file or directory mod_php4.c:54: zend_execute.h: No such file or directory mod_php4.c:55: zend_highlight.h: No such file or directory mod_php4.c:56: zend_indent.h: No such file or directory mod_php4.c:58: ext/standard/php_standard.h: No such file or directory make[4]: *** [mod_php4.o] Error 1 make[3]: *** [all] Error 1 make[2]: *** [subdirs] Error 1 make[2]: Leaving directory `/usr/local/apache_1.3.12/src' make[1]: *** [build-std] Error 2 make[1]: Leaving directory `/usr/local/apache_1.3.12' make: *** [build] Error 2 [root@system2 apache_1.3.12]# How can I solve this error? Thanks. Anthony D'Souza Systems Architecture Globix Corporation adsouza@globix.net