We use Teensy 2.0++ with firmware compiled with Atmel. We want to convert it to the Arduino environment. If we convert it it still has some errors in the software which we can not fix it as we do not have the time to do so.
Mainly the routine #include "usb_serial.h" creates a compiling error.
If it passes the Arduino compilation with all code enabled and without an error message then my programmer will test it and your job is done.