/usr/include/gnuradio/atsc/ is in gnuradio-dev 3.7.9.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gnuradio/atsc/CMakeLists.txt
/usr/include/gnuradio/atsc/api.h
/usr/include/gnuradio/atsc/basic_trellis_encoder_impl.h
/usr/include/gnuradio/atsc/bit_timing_loop.h
/usr/include/gnuradio/atsc/consts.h
/usr/include/gnuradio/atsc/convolutional_interleaver.h
/usr/include/gnuradio/atsc/create_atsci_equalizer.h
/usr/include/gnuradio/atsc/create_atsci_fs_checker.h
/usr/include/gnuradio/atsc/create_atsci_fs_correlator.h
/usr/include/gnuradio/atsc/data_interleaver_impl.h
/usr/include/gnuradio/atsc/deinterleaver.h
/usr/include/gnuradio/atsc/depad.h
/usr/include/gnuradio/atsc/derandomizer.h
/usr/include/gnuradio/atsc/diag_output_impl.h
/usr/include/gnuradio/atsc/ds_to_softds.h
/usr/include/gnuradio/atsc/equalizer.h
/usr/include/gnuradio/atsc/equalizer_impl.h
/usr/include/gnuradio/atsc/equalizer_lms2_impl.h
/usr/include/gnuradio/atsc/equalizer_lms_impl.h
/usr/include/gnuradio/atsc/equalizer_nop_impl.h
/usr/include/gnuradio/atsc/fake_single_viterbi_impl.h
/usr/include/gnuradio/atsc/field_sync_demux.h
/usr/include/gnuradio/atsc/field_sync_mux.h
/usr/include/gnuradio/atsc/fpll.h
/usr/include/gnuradio/atsc/fs_checker.h
/usr/include/gnuradio/atsc/fs_checker_impl.h
/usr/include/gnuradio/atsc/fs_checker_naive_impl.h
/usr/include/gnuradio/atsc/fs_correlator_impl.h
/usr/include/gnuradio/atsc/fs_correlator_naive_impl.h
/usr/include/gnuradio/atsc/interleaver.h
/usr/include/gnuradio/atsc/interleaver_fifo.h
/usr/include/gnuradio/atsc/pad.h
/usr/include/gnuradio/atsc/pnXXX_impl.h
/usr/include/gnuradio/atsc/randomizer.h
/usr/include/gnuradio/atsc/randomizer_impl.h
/usr/include/gnuradio/atsc/reed_solomon_impl.h
/usr/include/gnuradio/atsc/rs_decoder.h
/usr/include/gnuradio/atsc/rs_encoder.h
/usr/include/gnuradio/atsc/single_viterbi_impl.h
/usr/include/gnuradio/atsc/sliding_correlator_impl.h
/usr/include/gnuradio/atsc/sssr_impl.h
/usr/include/gnuradio/atsc/syminfo_impl.h
/usr/include/gnuradio/atsc/sync_tag_impl.h
/usr/include/gnuradio/atsc/trellis_encoder.h
/usr/include/gnuradio/atsc/trellis_encoder_impl.h
/usr/include/gnuradio/atsc/types.h
/usr/include/gnuradio/atsc/viterbi_decoder.h
/usr/include/gnuradio/atsc/viterbi_decoder_impl.h