Hi i have a problem with the Qdevelop,

Compileren (make)...
C:/Qt/4.6.3/mingw/bin/mingw32-make -f Makefile.Release
mingw32-make[1]: Entering directory `C:/Users/C-Killa/Documents/C++/test'
g++ -c -O2 -Wall -frtti -fexceptions -mthreads -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I"c:\Qt\4.6.3\qt\include\QtCore" -I"c:\Qt\4.6.3\qt\include\QtGui" -I"c:\Qt\4.6.3\qt\include" -I"c:\Qt\4.6.3\qt\include\ActiveQt" -I"build" -I"build" -I"c:\Qt\4.6.3\qt\mkspecs\win32-g++" -o build\dialogimpl.o src\dialogimpl.cpp
mingw32-make[1]: Leaving directory `C:/Users/C-Killa/Documents/C++/test'
'g++' is not recognized as an internal or external command,
operable program or batch file.
mingw32-make[1]: *** [build/dialogimpl.o] Error 1
mingw32-make: *** [release] Error 2
---------------------- Build finished without error----------------------
Can someone help me to solve this problem?