/usr/include/seqan/graph_align/ is in libseqan2-dev 2.3.2+dfsg2-4ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/seqan/graph_align/graph_algorithm_refine_align.h
/usr/include/seqan/graph_align/graph_algorithm_refine_aligngraph.h
/usr/include/seqan/graph_align/graph_algorithm_refine_annotation.h
/usr/include/seqan/graph_align/graph_algorithm_refine_exact.h
/usr/include/seqan/graph_align/graph_algorithm_refine_exact_iterative.h
/usr/include/seqan/graph_align/graph_algorithm_refine_fragment.h
/usr/include/seqan/graph_align/graph_algorithm_refine_inexact.h
/usr/include/seqan/graph_align/graph_algorithm_refine_scoring.h
/usr/include/seqan/graph_align/graph_impl_align.h
/usr/include/seqan/graph_align/graph_impl_align_adapt.h