[root@queues asterisk]# pwd
/usr/src/asterisk
[root@queues asterisk]# cd /usr/src/asterisk; patch -p0 <channels/chan_agent.diff
can't find file to patch at input line 3
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|--- branches/1.4/channels/chan_agent.c 2008/03/18 17:25:57     109574
|+++ branches/1.4/channels/chan_agent.c 2008/03/18 17:58:11     109575
--------------------------
File to patch: