/usr/include/cutl/ is in libcutl-dev 1.10.0+ds1-1+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/cutl/compiler/
/usr/include/cutl/compiler/code-stream.hxx
/usr/include/cutl/compiler/code-stream.txx
/usr/include/cutl/compiler/context.hxx
/usr/include/cutl/compiler/context.txx
/usr/include/cutl/compiler/cxx-indenter.hxx
/usr/include/cutl/compiler/cxx-indenter.ixx
/usr/include/cutl/compiler/cxx-indenter.txx
/usr/include/cutl/compiler/sloc-counter.hxx
/usr/include/cutl/compiler/sloc-counter.txx
/usr/include/cutl/compiler/traversal.hxx
/usr/include/cutl/compiler/traversal.txx
/usr/include/cutl/compiler/type-id.hxx
/usr/include/cutl/compiler/type-id.ixx
/usr/include/cutl/compiler/type-id.txx
/usr/include/cutl/compiler/type-info.hxx
/usr/include/cutl/compiler/type-info.ixx
/usr/include/cutl/container/
/usr/include/cutl/container/any.hxx
/usr/include/cutl/container/graph.hxx
/usr/include/cutl/container/graph.txx
/usr/include/cutl/container/key.hxx
/usr/include/cutl/container/map-iterator.hxx
/usr/include/cutl/container/multi-index.hxx
/usr/include/cutl/container/pointer-iterator.hxx
/usr/include/cutl/details/
/usr/include/cutl/details/config.h
/usr/include/cutl/details/config.hxx
/usr/include/cutl/details/export.hxx
/usr/include/cutl/details/genx/
/usr/include/cutl/details/genx/genx.h
/usr/include/cutl/exception.hxx
/usr/include/cutl/fs/
/usr/include/cutl/fs/auto-remove.hxx
/usr/include/cutl/fs/exception.hxx
/usr/include/cutl/fs/path.hxx
/usr/include/cutl/fs/path.ixx
/usr/include/cutl/fs/path.txx
/usr/include/cutl/meta/
/usr/include/cutl/meta/answer.hxx
/usr/include/cutl/meta/class-p.hxx
/usr/include/cutl/meta/polymorphic-p.hxx
/usr/include/cutl/meta/remove-c.hxx
/usr/include/cutl/meta/remove-cv.hxx
/usr/include/cutl/meta/remove-p.hxx
/usr/include/cutl/meta/remove-v.hxx
/usr/include/cutl/re/
/usr/include/cutl/re.hxx
/usr/include/cutl/re/re.txx
/usr/include/cutl/shared-ptr/
/usr/include/cutl/shared-ptr.hxx
/usr/include/cutl/shared-ptr/base.hxx
/usr/include/cutl/shared-ptr/base.ixx
/usr/include/cutl/shared-ptr/base.txx
/usr/include/cutl/static-ptr.hxx
/usr/include/cutl/xml/
/usr/include/cutl/xml/exception.hxx
/usr/include/cutl/xml/parser.hxx
/usr/include/cutl/xml/parser.ixx
/usr/include/cutl/xml/parser.txx
/usr/include/cutl/xml/qname.hxx
/usr/include/cutl/xml/serializer.hxx
/usr/include/cutl/xml/serializer.ixx
/usr/include/cutl/xml/value-traits.hxx
/usr/include/cutl/xml/value-traits.txx