/usr/include/libhocr/ is in libhocr-dev 0.10.18-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libhocr/ho_array.h
/usr/include/libhocr/ho_array_hist.h
/usr/include/libhocr/ho_array_stat.h
/usr/include/libhocr/ho_bitmap.h
/usr/include/libhocr/ho_bitmap_hist.h
/usr/include/libhocr/ho_dimentions.h
/usr/include/libhocr/ho_font.h
/usr/include/libhocr/ho_gtk.h
/usr/include/libhocr/ho_layout.h
/usr/include/libhocr/ho_linguistics.h
/usr/include/libhocr/ho_objmap.h
/usr/include/libhocr/ho_pixbuf.h
/usr/include/libhocr/ho_recognize.h
/usr/include/libhocr/ho_recognize_font_1.h
/usr/include/libhocr/ho_recognize_font_2.h
/usr/include/libhocr/ho_recognize_font_3.h
/usr/include/libhocr/ho_recognize_font_4.h
/usr/include/libhocr/ho_recognize_font_5.h
/usr/include/libhocr/ho_recognize_font_6.h
/usr/include/libhocr/ho_recognize_nikud.h
/usr/include/libhocr/ho_segment.h
/usr/include/libhocr/ho_string.h
/usr/include/libhocr/hocr.h
/usr/include/libhocr/hocrpp.h