QtWayland does not compile from source tarballs because generated protocol headers are not on the include path

seems like the header file QtWaylandCompositor/private/qwayland-server-text-input-unstable-v2.h is not distributed with the source package.

the log is attached below.

cd qtwayland/ && ( test -e Makefile || /home/fs/build-qt57-s/qtbase/bin/qmake /home/fs/qt-everywhere-opensource-src-5.7.0-rc/qtwayland/qtwayland.pro -qtconf /home/fs/build-qt57-s/qtbase/bin/qt.conf -o Makefile ) && make -f Makefile
make[1]: Entering directory '/home/fs/build-qt57-s/qtwayland'
cd src/ && ( test -e Makefile || /home/fs/build-qt57-s/qtbase/bin/qmake /home/fs/qt-everywhere-opensource-src-5.7.0-rc/qtwayland/src/src.pro -qtconf /home/fs/build-qt57-s/qtbase/bin/qt.conf -o Makefile ) && make -f Makefile
make[2]: Entering directory '/home/fs/build-qt57-s/qtwayland/src'
cd qtwaylandscanner/ && ( test -e Makefile || /home/fs/build-qt57-s/qtbase/bin/qmake /home/fs/qt-everywhere-opensource-src-5.7.0-rc/qtwayland/src/qtwaylandscanner/qtwaylandscanner.pro -qtconf /home/fs/build-qt57-s/qtbase/bin/qt.conf -o Makefile ) && make -f Makefile
make[3]: Entering directory '/home/fs/build-qt57-s/qtwayland/src/qtwaylandscanner'
make[3]: Nothing to be done for 'first'.
make[3]: Leaving directory '/home/fs/build-qt57-s/qtwayland/src/qtwaylandscanner'
cd compositor/ && ( test -e Makefile || /home/fs/build-qt57-s/qtbase/bin/qmake /home/fs/qt-everywhere-opensource-src-5.7.0-rc/qtwayland/src/compositor/compositor.pro -qtconf /home/fs/build-qt57-s/qtbase/bin/qt.conf -o Makefile ) && make -f Makefile
make[3]: Entering directory '/home/fs/build-qt57-s/qtwayland/src/compositor'
compiling /home/fs/qt-everywhere-opensource-src-5.7.0-rc/qtwayland/src/shared/qwaylandinputmethodeventbuilder.cpp
/home/fs/qt-everywhere-opensource-src-5.7.0-rc/qtwayland/src/shared/qwaylandinputmethodeventbuilder.cpp:46:80: fatal error: QtWaylandCompositor/private/qwayland-server-text-input-unstable-v2.h: No such file or directory
#include <QtWaylandCompositor/private/qwayland-server-text-input-unstable-v2.h>
^
compilation terminated.
Makefile:8042: recipe for target '.obj/qwaylandinputmethodeventbuilder.o' failed
make[3]: *** [.obj/qwaylandinputmethodeventbuilder.o] Error 1
make[3]: Leaving directory '/home/fs/build-qt57-s/qtwayland/src/compositor'
Makefile:71: recipe for target 'sub-compositor-make_first' failed
make[2]: *** [sub-compositor-make_first] Error 2
make[2]: Leaving directory '/home/fs/build-qt57-s/qtwayland/src'
Makefile:44: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2