Help!I don't found the file obect

Hello,

I’m newbe of gnu radio, I have successfully tested programs benchmark_tx
and rx.
Now I would like to modify the file c. I tried to change the file
“gr_crc32.cc” situated in:

gnuradio-3.3.0/gnuradio-core/src/lib/general

After that I recompile with the make command, from the same folder. The
problem is that I don’t see any changes, probably because the object
file is not overwritten …

Can you tell me how?

Hello everyone,
Diego.