After compiling the Apache don´t start

Hi I was a successful compiling, and modify the conf/httpd.conf uncomment the line for php4 and add the line LoadModule php4_module libexec/libphp4.so and before this when i do and apachectl start, the follow is the output ; Syntax error on line 209 of /usr/local/apache-1.3.14/conf/httpd.conf: Invalid command 'LoadModule', perhaps mis-spelled or defined by a module not included in the server configuration bin/apachectl start: httpd could not be started then I delete the line LoadModule and start without pproblem, but don`t interpreted the php instructions. What can be do wrong ??? Thanks for your help