/usr/include/regina-normal/manifold/ is in regina-normal-dev 4.95-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/regina-normal/manifold/ngraphloop.h
/usr/include/regina-normal/manifold/ngraphpair.h
/usr/include/regina-normal/manifold/ngraphtriple.h
/usr/include/regina-normal/manifold/nhandlebody.h
/usr/include/regina-normal/manifold/nlensspace.h
/usr/include/regina-normal/manifold/nmanifold.h
/usr/include/regina-normal/manifold/notation.h
/usr/include/regina-normal/manifold/nsfs.h
/usr/include/regina-normal/manifold/nsfsaltset.h
/usr/include/regina-normal/manifold/nsimplesurfacebundle.h
/usr/include/regina-normal/manifold/nsnappeacensusmfd.h
/usr/include/regina-normal/manifold/ntorusbundle.h