Are you talking about the module mod_gzip. Please try executing the commands httpd -M | grep mod_gzip and httpd -l | grep mod_gzip to find whether the module is enabled in the server. If it is not enabled it can be done compiling apache using easyapache.
You are still giving relatively scant details, but from your description, I think you may be looking for mod_deflate. mod_deflate uses gzip to compress data transferred between httpd and the Web browser. mod_deflate is an option that is available in EasyApache, and it is listed in Step #6, Exhaustive Options List. It is labeled simply Deflate.
Apache and PHP will stay in operation while EasyApache builds the new Apache and PHP. If there is any problem with the newly built Apache and PHP, EasyApache will copy the old, working versions back into place and restart Apache without your intervention. Your server will only start using the new Apache and PHP when EasyApache has successfully built them and been able to start them without encountering errors.