/usr/include/ITK-4.5/gcc/ is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ITK-4.5/gcc-295/vcl_algorithm.txx
/usr/include/ITK-4.5/gcc-295/vcl_complex.h
/usr/include/ITK-4.5/gcc-295/vcl_complex.txx
/usr/include/ITK-4.5/gcc-295/vcl_deque.txx
/usr/include/ITK-4.5/gcc-295/vcl_functional.txx
/usr/include/ITK-4.5/gcc-295/vcl_iomanip.h
/usr/include/ITK-4.5/gcc-295/vcl_ios.h
/usr/include/ITK-4.5/gcc-295/vcl_iterator.txx
/usr/include/ITK-4.5/gcc-295/vcl_list.txx
/usr/include/ITK-4.5/gcc-295/vcl_map.txx
/usr/include/ITK-4.5/gcc-295/vcl_memory.h
/usr/include/ITK-4.5/gcc-295/vcl_queue.txx
/usr/include/ITK-4.5/gcc-295/vcl_set.txx
/usr/include/ITK-4.5/gcc-295/vcl_string.txx
/usr/include/ITK-4.5/gcc-295/vcl_utility.txx
/usr/include/ITK-4.5/gcc-295/vcl_vector.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_algorithm.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_deque.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_functional.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_iterator.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_list.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_map.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_set.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_string.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_utility.txx
/usr/include/ITK-4.5/gcc-libstdcxx-v3/vcl_vector.txx
/usr/include/ITK-4.5/gcc/vcl_cmath.h
/usr/include/ITK-4.5/gcc/vcl_cstdlib.h