Compile files in /linuxcnc/lib/

Hello,

I use RIP installation.
If I debug files in the /linuxcnc/src folder, I just need to be in the /linuxcnc/src folder and type $ make. Then only what I edited is compiled.

If I debug files in the /linuxcnc/lib folder, I am in the /linuxcnc/src folder and type $ make, nothing happens.
I have to type $ make -B, but it takes a long time.

How should I debug the file:
/linuxcnc/lib/python/gladevcp/builtin-panels/gtk_little_probe/gtk_little_probe.py
?