1. create a new application project
2. select QNX kit for it
3. add the code bellow to main.cpp

    
   #ifdef Q_OS_QNX 
       qDebug("qnx");
   #endif
   

Result: the code is grayed out
Expected result: the code is not grayed out

Workaround: add qnx: DEFINES+=Q_OS_QNX to the pro file
Note: code model inspector doesn't show the Q_OS_QNX, the code above builds and prints qnx on qnx.