/usr/include/gnuradio/digital/ is in gnuradio-dev 3.7.2.1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gnuradio/digital/additive_scrambler_bb.h
/usr/include/gnuradio/digital/api.h
/usr/include/gnuradio/digital/binary_slicer_fb.h
/usr/include/gnuradio/digital/chunks_to_symbols_bc.h
/usr/include/gnuradio/digital/chunks_to_symbols_bf.h
/usr/include/gnuradio/digital/chunks_to_symbols_ic.h
/usr/include/gnuradio/digital/chunks_to_symbols_if.h
/usr/include/gnuradio/digital/chunks_to_symbols_sc.h
/usr/include/gnuradio/digital/chunks_to_symbols_sf.h
/usr/include/gnuradio/digital/clock_recovery_mm_cc.h
/usr/include/gnuradio/digital/clock_recovery_mm_ff.h
/usr/include/gnuradio/digital/cma_equalizer_cc.h
/usr/include/gnuradio/digital/constellation.h
/usr/include/gnuradio/digital/constellation_decoder_cb.h
/usr/include/gnuradio/digital/constellation_receiver_cb.h
/usr/include/gnuradio/digital/constellation_soft_decoder_cf.h
/usr/include/gnuradio/digital/correlate_access_code_bb.h
/usr/include/gnuradio/digital/correlate_access_code_tag_bb.h
/usr/include/gnuradio/digital/correlate_and_sync_cc.h
/usr/include/gnuradio/digital/costas_loop_cc.h
/usr/include/gnuradio/digital/cpmmod_bc.h
/usr/include/gnuradio/digital/crc32.h
/usr/include/gnuradio/digital/crc32_bb.h
/usr/include/gnuradio/digital/descrambler_bb.h
/usr/include/gnuradio/digital/diff_decoder_bb.h
/usr/include/gnuradio/digital/diff_encoder_bb.h
/usr/include/gnuradio/digital/diff_phasor_cc.h
/usr/include/gnuradio/digital/fll_band_edge_cc.h
/usr/include/gnuradio/digital/framer_sink_1.h
/usr/include/gnuradio/digital/glfsr.h
/usr/include/gnuradio/digital/glfsr_source_b.h
/usr/include/gnuradio/digital/glfsr_source_f.h
/usr/include/gnuradio/digital/header_payload_demux.h
/usr/include/gnuradio/digital/kurtotic_equalizer_cc.h
/usr/include/gnuradio/digital/lfsr.h
/usr/include/gnuradio/digital/lms_dd_equalizer_cc.h
/usr/include/gnuradio/digital/map_bb.h
/usr/include/gnuradio/digital/metric_type.h
/usr/include/gnuradio/digital/mpsk_receiver_cc.h
/usr/include/gnuradio/digital/mpsk_snr_est.h
/usr/include/gnuradio/digital/mpsk_snr_est_cc.h
/usr/include/gnuradio/digital/ofdm_carrier_allocator_cvc.h
/usr/include/gnuradio/digital/ofdm_chanest_vcvc.h
/usr/include/gnuradio/digital/ofdm_cyclic_prefixer.h
/usr/include/gnuradio/digital/ofdm_equalizer_base.h
/usr/include/gnuradio/digital/ofdm_equalizer_simpledfe.h
/usr/include/gnuradio/digital/ofdm_equalizer_static.h
/usr/include/gnuradio/digital/ofdm_frame_acquisition.h
/usr/include/gnuradio/digital/ofdm_frame_equalizer_vcvc.h
/usr/include/gnuradio/digital/ofdm_frame_sink.h
/usr/include/gnuradio/digital/ofdm_insert_preamble.h
/usr/include/gnuradio/digital/ofdm_mapper_bcv.h
/usr/include/gnuradio/digital/ofdm_sampler.h
/usr/include/gnuradio/digital/ofdm_serializer_vcc.h
/usr/include/gnuradio/digital/ofdm_sync_sc_cfb.h
/usr/include/gnuradio/digital/packet_header_default.h
/usr/include/gnuradio/digital/packet_header_ofdm.h
/usr/include/gnuradio/digital/packet_headergenerator_bb.h
/usr/include/gnuradio/digital/packet_headerparser_b.h
/usr/include/gnuradio/digital/packet_sink.h
/usr/include/gnuradio/digital/pfb_clock_sync_ccf.h
/usr/include/gnuradio/digital/pfb_clock_sync_fff.h
/usr/include/gnuradio/digital/pn_correlator_cc.h
/usr/include/gnuradio/digital/probe_density_b.h
/usr/include/gnuradio/digital/probe_mpsk_snr_est_c.h
/usr/include/gnuradio/digital/scrambler_bb.h
/usr/include/gnuradio/digital/simple_correlator.h
/usr/include/gnuradio/digital/simple_framer.h
/usr/include/gnuradio/digital/simple_framer_sync.h