I tried to install the dbg extension, but when I check the phpinfo() output I can only see a line:

Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies
with DBG v2.15.5, (C) 2000,2007, by Dmitri Dmitrienko

I don't see a separate section for DBG. (as described in the INSTALL file in the dbg source). And the PHP DBG Wizard script says that the dbg extension is not installed.

I compiled the extension myself. My php version is 5.1.6. Apache 2.2.3, OS fedora core 6.

I added the following to /etc/php.ini

zend_extension=/usr/lib/php/modules/dbg.so
[Debugger]
debugger.enabled=on
debugger.profiler_enabled=on

Would appreciate any help in getting this working.
Thanks

In phpinfo() what does it show to be your path to php.ini?

This was resolved. I changed the entry in php.ini to

extension=dbg.so

and it worked.