Can't build PHP enabled Apache on Solaris8

I'm trying to build a Apache 1.3.20 server with the enable PHP 4.0.6 module.   I'm starting with both sources to perform the builds.  I've followed the install procedure found in the "php_manual_en.pdf" and on the website at "http://www.php.net/FAQ.php".  By the time I get to the portion of building apache, after building php, my 'make' fails with following excerpt: [...SNIP...] ===> src/modules/php4 gmake[4]: Entering directory `/export/home3/pkgs/apache_1.3.20/src/modules/php4' gcc -c  -I../../os/unix -I../../include   -DSOLARIS2=280 -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:47: php_ini.h: No such file or directory mod_php4.c:48: php_globals.h: No such file or directory mod_php4.c:49: SAPI.h: No such file or directory mod_php4.c:50: php_main.h: No such file or directory mod_php4.c:52: zend_compile.h: No such file or directory mod_php4.c:53: zend_execute.h: No such file or directory mod_php4.c:54: zend_highlight.h: No such file or directory mod_php4.c:55: zend_indent.h: No such file or directory mod_php4.c:57: ext/standard/php_standard.h: No such file or directory gmake[4]: *** [mod_php4.o] Error 1 gmake[4]: Leaving directory `/export/home3/pkgs/apache_1.3.20/src/modules/php4' gmake[3]: *** [all] Error 1 gmake[3]: Leaving directory `/export/home3/pkgs/apache_1.3.20/src/modules' gmake[2]: *** [subdirs] Error 1 gmake[2]: Leaving directory `/export/home3/pkgs/apache_1.3.20/src' gmake[1]: *** [build-std] Error 2 gmake[1]: Leaving directory `/export/home3/pkgs/apache_1.3.20' gmake: *** [build] Error 2 # [...end SNIP...] Yes...the files don't exist. Should they? Or should it not be trying to make mod_php4.c, b/c there is already a mod_php4.o. Please tell me about any "known-to-work' method for building a php enabled apache 1.3.20 server on Solaris8. Best Regards, John Ruff