/usr/include/osl/container/ is in libosl-dev 0.6.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/osl/container/bitXmask.h
/usr/include/osl/container/boardMask.h
/usr/include/osl/container/generalSimpleHashTable.h
/usr/include/osl/container/generalSimpleHashTable.tcc
/usr/include/osl/container/moveLogProbVector.h
/usr/include/osl/container/moveStack.h
/usr/include/osl/container/moveVector.h
/usr/include/osl/container/nearMask.h
/usr/include/osl/container/pieceMask.h
/usr/include/osl/container/pieceMask32.h
/usr/include/osl/container/pieceMask64.h
/usr/include/osl/container/pieceValues.h
/usr/include/osl/container/pieceVector.h
/usr/include/osl/container/pointerSet.h
/usr/include/osl/container/ptypeOSquareVector.h
/usr/include/osl/container/quadInt.h
/usr/include/osl/container/readme.h
/usr/include/osl/container/square8.h
/usr/include/osl/container/tripleInt.h