Failed build

mingw32-make[6]: Entering directory 'C:/SDK/sources/qt5/qtsensors/src/plugins/sensorgestures/qtsensors'
mingw32-make[6]: warning: -jN forced in submake: disabling jobserver mode.
g++ -c -pipe -fno-keep-inline-dllexport -g -fno-exceptions -frtti -Wall -Wextra -DUNICODE -DQT_NO_EXCEPTIONS -DQT_DLL -DQT_PLUGIN -DQT_QML_LIB -DQT_SENSORS_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I"C:\SDK\sources\qt5\qtdeclarative\include" -I"C:\SDK\sources\qt5\qtdeclarative\include\QtQml" -I"..\..\..\include" -I"..\..\..\include\QtSensors" -I"..\..\..\include\QtSensors\5.0.0" -I"..\..\..\include\QtSensors\5.0.0\QtSensors" -I"C:\SDK\sources\qt5\qtbase\include" -I"C:\SDK\sources\qt5\qtbase\include\QtNetwork" -I"C:\SDK\sources\qt5\qtbase\include\QtGui" -I"C:\SDK\sources\qt5\qtbase\include\QtCore" -I"debug" -I"C:\SDK\sources\qt5\qtbase\mkspecs\win32-g++" -o debug\qmllightsensor.o qmllightsensor.cpp
g++ -c -pipe -fno-keep-inline-dllexport -g -fno-exceptions -frtti -Wall -Wextra -DUNICODE -DQT_NO_EXCEPTIONS -DQT_DLL -DQT_PLUGIN -DQT_QML_LIB -DQT_SENSORS_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I"C:\SDK\sources\qt5\qtdeclarative\include" -I"C:\SDK\sources\qt5\qtdeclarative\include\QtQml" -I"..\..\..\include" -I"..\..\..\include\QtSensors" -I"..\..\..\include\QtSensors\5.0.0" -I"..\..\..\include\QtSensors\5.0.0\QtSensors" -I"C:\SDK\sources\qt5\qtbase\include" -I"C:\SDK\sources\qt5\qtbase\include\QtNetwork" -I"C:\SDK\sources\qt5\qtbase\include\QtGui" -I"C:\SDK\sources\qt5\qtbase\include\QtCore" -I"debug" -I"C:\SDK\sources\qt5\qtbase\mkspecs\win32-g++" -o debug\qmlmagnetometer.o qmlmagnetometer.cpp
generictiltsensor.cpp: In member function 'virtual bool GenericTiltSensor::filter(QAccelerometerReading*)':
generictiltsensor.cpp:139:16: error: 'M_PI_2' was not declared in this scope
generictiltsensor.cpp:146:16: error: 'M_PI_2' was not declared in this scope
Makefile.Debug:1106: recipe for target 'debug/generictiltsensor.o' failed
mingw32-make[6]: *** [debug/generictiltsensor.o] Error 1
mingw32-make[6]: *** Waiting for unfinished jobs....