Marco,
i fear that you will not be honest to your customer if you claim that your app is a 'c' app because it is compiled c code produced by the xHarbour (pre)compiler.
Please, have a look to the c code created from the xHarbour compiler.
And after you might compare it to a source code of a native c or c++ program.
A real c programmer would be very astonished if he had to work on the c output of xHarbour. ( i fear he would find it silly )
regards,
Detlef