在openSUSE上交叉编译一个windows可执行程序，出现下面的错误提示：
mylinux:/home/me/occlient/mirall-build # cmake -DCMAKE_BUILD_TYPE="Debug" ../mirall \
-DCMAKE_PREFIX_PATH=/opt/Qt5.2.1/5.2.1/gcc/lib/cmake/ \
-DCMAKE_TOOLCHAIN_FILE=../mirall/admin/win/Toolchain-mingw32-openSUSE.cmake
-- Found Qt5 core, checking for further dependencies...
CMake Error at /opt/Qt5.2.1/5.2.1/gcc/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:16 (message):
Failed to find "GL" in "" with CMAKE_CXX_LIBRARY_ARCHITECTURE "".
Call Stack (most recent call first):
/opt/Qt5.2.1/5.2.1/gcc/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:51 (_qt5gui_find_extra_libs)
/opt/Qt5.2.1/5.2.1/gcc/lib/cmake/Qt5Gui/Qt5GuiConfig.cmake:143 (include)
/opt/Qt5.2.1/5.2.1/gcc/lib/cmake/Qt5Quick/Qt5QuickConfig.cmake:88 (find_package)
/opt/Qt5.2.1/5.2.1/gcc/lib/cmake/Qt5WebKitWidgets/Qt5WebKitWidgetsConfig.cmake:88 (find_package)
cmake/modules/QtVersionAbstraction.cmake:17 (find_package)
CMakeLists.txt:34 (include)
这是哪儿的错误啊，是Qt 5有问题吗？
