[Interest] Qt5 on mingw fails immediately

[Jason H]

I am trying to build Qt 5 for the first time. I get to the make step ok, then I get:

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Qt is now configured for building. Just run mingw32-make.
To reconfigure, run mingw32-make confclean and configure.

+ C:/qt5/qtbase/bin/qmake C:/qt5/qt.pro

C:\qt5>mingw32-make
cd qtbase\ && mingw32-make -f Makefile
mingw32-make[1]: Entering directory `C:/qt5/qtbase'
cd src\tools\bootstrap\ && mingw32-make -f Makefile
mingw32-make[2]: Entering directory `C:/qt5/qtbase/src/tools/bootstrap'
mingw32-make -f Makefile.Debug
mingw32-make[3]: Entering directory `C:/qt5/qtbase/src/tools/bootstrap'
g++
 -c -fno-keep-inline-dllexport -g -frtti -fexceptions -mthreads -Wall 
-DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_BOOTSTRAPPED -DQT_LITE_UNICODE 
-DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_CODECS 
-DQT_NO_DATASTREAM -DQT_NO_GEOM_VARIANT -DQT_NO_LIBRARY -DQT_NO_QOBJECT 
-DQT_NO_STL -DQT_NO_SYSTEMLOCALE -DQT_NO_THREAD -DQT_NO_UNICODETABLES 
-DQT_NO_USING_NAMESPACE -DQT_NO_DEPRECATED -DQT_NODLL 
-I"..\..\..\include" -I"..\..\..\include\QtCore" 
-I"..\..\..\include\QtCore\5.0.0" 
-I"..\..\..\include\QtCore\5.0.0\QtCore" -I"..\..\3rdparty\zlib" 
-I"..\..\..\mkspecs\win32-g++" -o tmp\obj\debug_shared\qlatincodec.o 
..\..\corelib\codecs\qlatincodec.cpp
cc1plus.exe: error: unrecognized command line option "-fno-keep-inline-dllexport
"
mingw32-make[3]: *** [tmp/obj/debug_shared/qlatincodec.o] Error 1
mingw32-make[3]: Leaving directory `C:/qt5/qtbase/src/tools/bootstrap'
mingw32-make[2]: *** [debug] Error 2
mingw32-make[2]: Leaving directory `C:/qt5/qtbase/src/tools/bootstrap'
mingw32-make[1]: *** [sub-tools-bootstrap-make_default-ordered] Error 2
mingw32-make[1]: Leaving directory `C:/qt5/qtbase'
mingw32-make: *** [module-qtbase-make_default] Error 2

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immediately. Help?