/usr/include/ is in libsphinxbase-dev 0.8+5prealpha-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/sphinxbase/
/usr/include/x86_64-linux-gnu/sphinxbase/huff_code.h
/usr/include/x86_64-linux-gnu/sphinxbase/bitvec.h
/usr/include/x86_64-linux-gnu/sphinxbase/agc.h
/usr/include/x86_64-linux-gnu/sphinxbase/listelem_alloc.h
/usr/include/x86_64-linux-gnu/sphinxbase/case.h
/usr/include/x86_64-linux-gnu/sphinxbase/bitarr.h
/usr/include/x86_64-linux-gnu/sphinxbase/cmd_ln.h
/usr/include/x86_64-linux-gnu/sphinxbase/strfuncs.h
/usr/include/x86_64-linux-gnu/sphinxbase/feat.h
/usr/include/x86_64-linux-gnu/sphinxbase/jsgf.h
/usr/include/x86_64-linux-gnu/sphinxbase/profile.h
/usr/include/x86_64-linux-gnu/sphinxbase/f2c.h
/usr/include/x86_64-linux-gnu/sphinxbase/fixpoint.h
/usr/include/x86_64-linux-gnu/sphinxbase/mulaw.h
/usr/include/x86_64-linux-gnu/sphinxbase/fe.h
/usr/include/x86_64-linux-gnu/sphinxbase/heap.h
/usr/include/x86_64-linux-gnu/sphinxbase/mmio.h
/usr/include/x86_64-linux-gnu/sphinxbase/matrix.h
/usr/include/x86_64-linux-gnu/sphinxbase/ngram_model.h
/usr/include/x86_64-linux-gnu/sphinxbase/genrand.h
/usr/include/x86_64-linux-gnu/sphinxbase/ckd_alloc.h
/usr/include/x86_64-linux-gnu/sphinxbase/sphinx_config.h
/usr/include/x86_64-linux-gnu/sphinxbase/yin.h
/usr/include/x86_64-linux-gnu/sphinxbase/bio.h
/usr/include/x86_64-linux-gnu/sphinxbase/pio.h
/usr/include/x86_64-linux-gnu/sphinxbase/logmath.h
/usr/include/x86_64-linux-gnu/sphinxbase/cmn.h
/usr/include/x86_64-linux-gnu/sphinxbase/priority_queue.h
/usr/include/x86_64-linux-gnu/sphinxbase/sphinxbase_export.h
/usr/include/x86_64-linux-gnu/sphinxbase/filename.h
/usr/include/x86_64-linux-gnu/sphinxbase/byteorder.h
/usr/include/x86_64-linux-gnu/sphinxbase/glist.h
/usr/include/x86_64-linux-gnu/sphinxbase/hash_table.h
/usr/include/x86_64-linux-gnu/sphinxbase/ad.h
/usr/include/x86_64-linux-gnu/sphinxbase/prim_type.h
/usr/include/x86_64-linux-gnu/sphinxbase/fsg_model.h
/usr/include/x86_64-linux-gnu/sphinxbase/err.h
/usr/include/x86_64-linux-gnu/sphinxbase/sbthread.h
/usr/include/x86_64-linux-gnu/sphinxbase/clapack_lite.h