Compilation error at Debian 6 (missed declaration of CANFD_BRS)

I've got a following error while compilation:

g++ -c -pipe -O2 -std=c+11 -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -D_REENTRANT -fPIC -DQT_NO_FOREACH -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SERIALBUS_LIB -DQT_CORE_LIB -I. -I../../../../include -I../../../../include/QtSerialBus -I/build/packet/linux-64/qt-5.9.2/build/qt-everywhere-opensource-src-5.9.2/qtbase/include -I/build/packet/linux-64/qt-5.9.2/build/qt-everywhere-opensource-src-5.9.2/qtbase/include/QtCore -I.moc -I/build/packet/linux-64/qt-5.9.2/build/qt-everywhere-opensource-src-5.9.2/qtbase/mkspecs/linux-g+ -o .obj/socketcanbackend.o socketcanbackend.cpp}}
socketcanbackend.cpp: In member function 'virtual bool SocketCanBackend::writeFrame(const QCanBusFrame&)':
socketcanbackend.cpp:448:52: error: 'CANFD_BRS' was not declared in this scope
socketcanbackend.cpp:449:59: error: 'CANFD_ESI' was not declared in this scope
socketcanbackend.cpp: In member function 'void SocketCanBackend::readSocket()':
socketcanbackend.cpp:678:27: error: 'CANFD_BRS' was not declared in this scope
socketcanbackend.cpp:680:27: error: 'CANFD_ESI' was not declared in this scope

Also i've got notification from ./configure:

Note: QtSerialBus: Newer kernel needed for flexible data-rate frame support (canfd_frame).

I've fixed it locally by adding two following lines into file qtserialbus/src/plugins/canbus/socketcan/socketcanbackend.cpp after line 73:

#define CANFD_BRS 0x01
#define CANFD_ESI 0x02

Seems this bug was introduced while fixing this issue: QTBUG-56720