Location of app_confbridge.c in asterisk 11.7 using centos6

where is the location of app_confbridge.c in asterisk 11.7 using centos 6.5 where i need to add patch for supporting cli command confbridge kick all where it will kick all channels out of conference at a time.right now it kicks only one channel at a time .pls help

In the apps sub-directory of the source code tree. You will need to rebuild the software after patching.

thanks for replay ,i am using freepbx 2.11 installed using iso image .will these contain source code because ,in my installation there is no app folder at all.
pls help

This board is not the right place for FreePBX knowledge, but I would be very surprised if it contained the source code or development environment.