/usr/include/seqan/align/ is in seqan-dev 1.3-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/seqan/align/align_algorithms.h
/usr/include/seqan/align/align_base.h
/usr/include/seqan/align/align_cols_base.h
/usr/include/seqan/align/align_dynprog.h
/usr/include/seqan/align/align_generated_forwards.h
/usr/include/seqan/align/align_hirschberg.h
/usr/include/seqan/align/align_iterator_base.h
/usr/include/seqan/align/align_local_dynprog.h
/usr/include/seqan/align/align_local_dynprog_banded.h
/usr/include/seqan/align/align_myers.h
/usr/include/seqan/align/align_trace.h
/usr/include/seqan/align/gaps_array.h
/usr/include/seqan/align/gaps_base.h
/usr/include/seqan/align/gaps_iterator_base.h
/usr/include/seqan/align/gaps_sumlist.h
/usr/include/seqan/align/hirschberg_set.h
/usr/include/seqan/align/matrix_base.h