Build fails in Qt3d module because of missing openglextensions

Qt was configured for a cross-build to a system without Mesa or anything like that. When I build the build fails with:

make[3]: Leaving directory `/tmp/e2/build/build/qt3d/src/core'
cd render/ && ( test -e Makefile || /tmp/e2/build/build/qtbase/bin/qmake /tmp/e2/build/qt-everywhere-opensource-src-5.5.0-rc/qt3d/src/render/render.pro -o Makefile ) && make -f Makefile
Project ERROR: Unknown module(s) in QT: openglextensions
make[2]: *** [sub-render-make_first] Error 3
make[2]: Leaving directory `/tmp/e2/build/build/qt3d/src'
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory `/tmp/e2/build/build/qt3d'
make: *** [module-qt3d-make_first] Error 2