/usr/include/seqan/stream/ is in seqan-dev 1.4.1+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/seqan/stream/INFO
/usr/include/seqan/stream/adapt_cstdio.h
/usr/include/seqan/stream/adapt_fstream.h
/usr/include/seqan/stream/adapt_iostream.h
/usr/include/seqan/stream/adapt_mmap.h
/usr/include/seqan/stream/adapt_sstream.h
/usr/include/seqan/stream/concept_stream.h
/usr/include/seqan/stream/is.h
/usr/include/seqan/stream/lexical_cast.h
/usr/include/seqan/stream/read.h
/usr/include/seqan/stream/read_auto_format.h
/usr/include/seqan/stream/read_sam.h
/usr/include/seqan/stream/record_reader_base.h
/usr/include/seqan/stream/record_reader_double.h
/usr/include/seqan/stream/record_reader_double_mmap.h
/usr/include/seqan/stream/record_reader_single.h
/usr/include/seqan/stream/record_reader_single_mmap.h
/usr/include/seqan/stream/stream_base.h
/usr/include/seqan/stream/stream_bgzf.h
/usr/include/seqan/stream/stream_bz2_file.h
/usr/include/seqan/stream/stream_char_array.h
/usr/include/seqan/stream/stream_gz_file.h
/usr/include/seqan/stream/tokenize.h
/usr/include/seqan/stream/write.h