/usr/include/ITK-4.5/itksys/ is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ITK-4.5/itksys/Base64.h
/usr/include/ITK-4.5/itksys/CommandLineArguments.hxx
/usr/include/ITK-4.5/itksys/Configure.h
/usr/include/ITK-4.5/itksys/Configure.hxx
/usr/include/ITK-4.5/itksys/Directory.hxx
/usr/include/ITK-4.5/itksys/DynamicLoader.hxx
/usr/include/ITK-4.5/itksys/Encoding.h
/usr/include/ITK-4.5/itksys/Encoding.hxx
/usr/include/ITK-4.5/itksys/FStream.hxx
/usr/include/ITK-4.5/itksys/FundamentalType.h
/usr/include/ITK-4.5/itksys/Glob.hxx
/usr/include/ITK-4.5/itksys/MD5.h
/usr/include/ITK-4.5/itksys/Process.h
/usr/include/ITK-4.5/itksys/RegularExpression.hxx
/usr/include/ITK-4.5/itksys/SharedForward.h
/usr/include/ITK-4.5/itksys/String.hxx
/usr/include/ITK-4.5/itksys/System.h
/usr/include/ITK-4.5/itksys/SystemInformation.hxx
/usr/include/ITK-4.5/itksys/SystemTools.hxx
/usr/include/ITK-4.5/itksys/auto_ptr.hxx
/usr/include/ITK-4.5/itksys/cstddef
/usr/include/ITK-4.5/itksys/hash_fun.hxx
/usr/include/ITK-4.5/itksys/hash_map.hxx
/usr/include/ITK-4.5/itksys/hash_set.hxx
/usr/include/ITK-4.5/itksys/hashtable.hxx
/usr/include/ITK-4.5/itksys/ios/
/usr/include/ITK-4.5/itksys/ios/fstream
/usr/include/ITK-4.5/itksys/ios/iosfwd
/usr/include/ITK-4.5/itksys/ios/iostream
/usr/include/ITK-4.5/itksys/ios/sstream
/usr/include/ITK-4.5/itksys/stl/
/usr/include/ITK-4.5/itksys/stl/algorithm
/usr/include/ITK-4.5/itksys/stl/deque
/usr/include/ITK-4.5/itksys/stl/exception
/usr/include/ITK-4.5/itksys/stl/functional
/usr/include/ITK-4.5/itksys/stl/iterator
/usr/include/ITK-4.5/itksys/stl/list
/usr/include/ITK-4.5/itksys/stl/map
/usr/include/ITK-4.5/itksys/stl/memory
/usr/include/ITK-4.5/itksys/stl/new
/usr/include/ITK-4.5/itksys/stl/numeric
/usr/include/ITK-4.5/itksys/stl/queue
/usr/include/ITK-4.5/itksys/stl/set
/usr/include/ITK-4.5/itksys/stl/stack
/usr/include/ITK-4.5/itksys/stl/stdexcept
/usr/include/ITK-4.5/itksys/stl/string
/usr/include/ITK-4.5/itksys/stl/string.hxx
/usr/include/ITK-4.5/itksys/stl/utility
/usr/include/ITK-4.5/itksys/stl/vector