/usr/include/casacore/casa/System/ is in casacore-dev 2.2.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/casacore/casa/System/Aipsrc.h
/usr/include/casacore/casa/System/AipsrcValue.h
/usr/include/casacore/casa/System/AipsrcValue.tcc
/usr/include/casacore/casa/System/AipsrcVector.h
/usr/include/casacore/casa/System/AipsrcVector.tcc
/usr/include/casacore/casa/System/AppInfo.h
/usr/include/casacore/casa/System/Casarc.h
/usr/include/casacore/casa/System/Choice.h
/usr/include/casacore/casa/System/ObjectID.h
/usr/include/casacore/casa/System/PGPlotter.h
/usr/include/casacore/casa/System/PGPlotterInterface.h
/usr/include/casacore/casa/System/PGPlotterNull.h
/usr/include/casacore/casa/System/ProgressMeter.h