/usr/include/gnuradio/fec/ is in gnuradio-dev 3.7.9.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gnuradio/fec/api.h
/usr/include/gnuradio/fec/async_decoder.h
/usr/include/gnuradio/fec/async_encoder.h
/usr/include/gnuradio/fec/ber_bf.h
/usr/include/gnuradio/fec/cc_common.h
/usr/include/gnuradio/fec/cc_decoder.h
/usr/include/gnuradio/fec/cc_encoder.h
/usr/include/gnuradio/fec/ccsds_encoder.h
/usr/include/gnuradio/fec/conv_bit_corr_bb.h
/usr/include/gnuradio/fec/decode_ccsds_27_fb.h
/usr/include/gnuradio/fec/decoder.h
/usr/include/gnuradio/fec/depuncture_bb.h
/usr/include/gnuradio/fec/dummy_decoder.h
/usr/include/gnuradio/fec/dummy_encoder.h
/usr/include/gnuradio/fec/encode_ccsds_27_bb.h
/usr/include/gnuradio/fec/encoder.h
/usr/include/gnuradio/fec/fec_mtrx.h
/usr/include/gnuradio/fec/generic_decoder.h
/usr/include/gnuradio/fec/generic_encoder.h
/usr/include/gnuradio/fec/ldpc_G_matrix.h
/usr/include/gnuradio/fec/ldpc_H_matrix.h
/usr/include/gnuradio/fec/ldpc_bit_flip_decoder.h
/usr/include/gnuradio/fec/ldpc_decoder.h
/usr/include/gnuradio/fec/ldpc_encoder.h
/usr/include/gnuradio/fec/ldpc_gen_mtrx_encoder.h
/usr/include/gnuradio/fec/ldpc_par_mtrx_encoder.h
/usr/include/gnuradio/fec/polar_common.h
/usr/include/gnuradio/fec/polar_decoder_common.h
/usr/include/gnuradio/fec/polar_decoder_sc.h
/usr/include/gnuradio/fec/polar_decoder_sc_list.h
/usr/include/gnuradio/fec/polar_decoder_sc_systematic.h
/usr/include/gnuradio/fec/polar_encoder.h
/usr/include/gnuradio/fec/polar_encoder_systematic.h
/usr/include/gnuradio/fec/puncture_bb.h
/usr/include/gnuradio/fec/puncture_ff.h
/usr/include/gnuradio/fec/repetition_decoder.h
/usr/include/gnuradio/fec/repetition_encoder.h
/usr/include/gnuradio/fec/rs.h
/usr/include/gnuradio/fec/tagged_decoder.h
/usr/include/gnuradio/fec/tagged_encoder.h
/usr/include/gnuradio/fec/viterbi.h