[Discuss-gnuradio] How can I find the cc-Files of GNU-Radio to modify or edit them?

[jenspen2]

Hello everybody,

I'm new to Linux and GNU-Radio but I've searched the archives and faq 
but I cannot find a proper answer.
I want to modify a flowchart e.g. the audio sink and want to enter the 
cc-files.

I've installed GNU-Radio following the instruction below:
http://gnuradio.org/redmine/projects/gnuradio/wiki/UbuntuInstall

But I cannot find the cc-files. I've only found the Header-Files (.h) in 
the /usr/local/include path.

I thank you in advance.

With best regards
Jenspen