I have same problem. I could not find any make file in that directory
We no longer use the make build system for our examples.
We now use "waf"; I've updated the instructions on the wiki to reflect
Additionally, the INS_generic example is currently broken. I have created
a pull request (https://github.com/ArduPilot/ardupilot/pull/5055) to fix
that, and in the meantime try one of the other examples (the DataFlash
example is pretty verbose - and just tested ).