How do I add -D_WIN32_WINNT=0x0502 to qterminal compile flag (MinGW)

[Tatsuro MATSUOKA]

Hello

I am now re-challenging to build octave-gui on MinGW.
 
In compiling, QWinTerminalImpl.cpp

#***************
g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT 
-DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW 
-DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT 
-I'c:/Programs/Qt/4.8.0/include/QtCore' -I'c:/Programs/Qt/4.8.0/include/QtGui' 
-I'c:/Programs/Qt/4.8.0/include' -I'.' 
-I'c:/Programs/Qt/4.8.0/include/ActiveQt' -I'release' 
-I'c:/Programs/Qt/4.8.0/mkspecs/default' -o release/QWinTerminalImpl.o 
win32/QWinTerminalImpl.cpp
win32/QWinTerminalImpl.cpp: In constructor 
'QConsolePrivate::QConsolePrivate(QWinTerminalImpl*, const QString&)':
win32/QWinTerminalImpl.cpp:132:10: warning: 'QConsolePrivate::m_process' will 
be initialized after [-Wreorder]
win32/QWinTerminalImpl.cpp:120:8: warning:   'bool 
QConsolePrivate::m_inWheelEvent' [-Wreorder]
win32/QWinTerminalImpl.cpp:142:1: warning:   when initialized here [-Wreorder]
win32/QWinTerminalImpl.cpp:200:39: error: 'GetConsoleWindow' was not declared 
in this scope
make[3]: *** [release/QWinTerminalImpl.o] Error 1
make[3]: Leaving directory 
`/home/octaves/hg/octave-gui/gui/qterminal/libqterminal'
make[2]: *** [release] Error 2
make[2]: Leaving directory 
`/home/octaves/hg/octave-gui/gui/qterminal/libqterminal'
make[1]: *** [sub-libqterminal-make_default] Error 2
make[1]: Leaving directory `/home/octaves/hg/octave-gui/gui/qterminal'
make: *** [sub-qterminal-make_default] Error 2
#****************

I manually added -D_WIN32_WINNT=0x0502 on the console and compile was 
successful.

I modified "DEFINES" in libqterminal.pro but nothing was changed.

How do I add -D_WIN32_WINNT=0x0502 to qterminal compile flag ?

Regards

Tatsuro