Hi Cedric,
The command to use for building on windows is (after setting up PATH to include the path to make.exe)
make.exe -B -f Makefile CONF=default -j 8
You need to run this from the project directory (/Airco)
so I suspect the equivalent on Linux is:
make -B -f Makefile CONF=default -j 8
"default" is the configuration name specified when you used Mplab X to create the project
"Makefile" is a file called "Makefile" in the project directory, which Mplab X should have created for you.
ie there should be a "Makefile" in the /Airco directory
Good Luck,
Alex