/usr/include/x86_64-linux-gnu/eckit/filesystem/ is in libodb-api-dev 0.17.6-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/eckit/filesystem/BasePathName.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/BasePathNameT.cc
/usr/include/x86_64-linux-gnu/eckit/filesystem/BasePathNameT.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/FileSpace.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/FileSpaceStrategies.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/FileSystem.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/FileSystemSize.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/LocalPathName.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/PathExpander.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/PathName.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/TempFile.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/TmpFile.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/URI.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/URIManager.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/marsfs/
/usr/include/x86_64-linux-gnu/eckit/filesystem/marsfs/MarsFSClient.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/marsfs/MarsFSFile.h
/usr/include/x86_64-linux-gnu/eckit/filesystem/marsfs/MarsFSPath.h