First login into your server with the root login details

cd /home/cpapachebuild/buildapache/apache_1.3.31/src/modules/proxy/

or

cd /home/cpeasyapache/src/httpd-2.0.63/modules/proxy

Then run command:

/usr/local/apache/bin/apxs -i -c *.c

Add the following module to the httpd.conf to load proxy module with the httpd configuration file:

LoadModule proxy_module libexec/mod_proxy.so

And then restart the Apache service:
service httpd restart
or
/etc/init.d/httpd restart

You can check proxy installed or not on your server by using following command.

/usr/local/apache/bin/httpd -l | grep proxy