Only these constants from QtGlobal namespace are defined:
Number with Qt version. E.g. 0x040100.
A string with Qt version. See qVersion().
True on X11 environment - UNIXes, except Mac OS X. False in all other cases.
True on Mac OS X. False in all other cases.
True on Qt Embedded Linux. False in all other cases.
True on MS Windows. False in all other cases.