For the curiosity, I have tested to build our large more than 20 years old #RTEMS SuiTk based application of the complete TECHNIC I which represents 83182 lines of code (+20773 comments), 15014 lines of headers (+7568 comments) and 72607 lines of GUI XML description with #Microwindows / #NanoX #NuttX port and the results runs in the mode intended for GUI testing under #Linux in baremetal x86_64 #NuttX BSP in #QEMU. The pure #Linux / #POSIX mode with sensors and actuators stubs has been available from the project start. For more generations of that development see the related #PiKRON’s medical development page.