Installing a Apache module, without re-compiling the entire web server is easy with Apache extension tool (apxs). For that you need the source code you have used for compiling the Apache server. Here I will show you show you how to add Mod_Rewrite in Apache server.

Apache_module_Installation

Go to your Apache source directory where your module source codes are stored. Here you can see many files with .c extension.

# cd httpd-VERSION/modules/mappers
# apxs  -i -a -c mod_rewrite.c
  
Where 
  c = Compile the source code
  i = Copy the compiled module (.so) file to the Apache module directory.
  a = Activates the module is Apache, by adding required directives in httpd.conf.

Activate the newly added module by restarting Apache after checking the Apache config.
# apachectl configtest
Syntax OK
# apachectl graceful