/usr/include/ is in libsunpinyin-dev 3.0.0~git20160910-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sunpinyin-2.0/ime-core/
/usr/include/sunpinyin-2.0/slm/
/usr/include/sunpinyin-2.0/
/usr/include/sunpinyin-2.0/ime-core/ic_history.h
/usr/include/sunpinyin-2.0/ime-core/imi_context.h
/usr/include/sunpinyin-2.0/ime-core/imi_data.h
/usr/include/sunpinyin-2.0/ime-core/imi_defines.h
/usr/include/sunpinyin-2.0/ime-core/imi_funcobjs.h
/usr/include/sunpinyin-2.0/ime-core/imi_glibHandler.h
/usr/include/sunpinyin-2.0/ime-core/imi_keys.h
/usr/include/sunpinyin-2.0/ime-core/imi_option_event.h
/usr/include/sunpinyin-2.0/ime-core/imi_option_keys.h
/usr/include/sunpinyin-2.0/ime-core/imi_options.h
/usr/include/sunpinyin-2.0/ime-core/imi_uiobjects.h
/usr/include/sunpinyin-2.0/ime-core/imi_view.h
/usr/include/sunpinyin-2.0/ime-core/imi_view_classic.h
/usr/include/sunpinyin-2.0/ime-core/imi_winHandler.h
/usr/include/sunpinyin-2.0/ime-core/lattice_states.h
/usr/include/sunpinyin-2.0/ime-core/userdict.h
/usr/include/sunpinyin-2.0/slm/ids2ngram/
/usr/include/sunpinyin-2.0/ime-core/utils.h
/usr/include/sunpinyin-2.0/lexicon/
/usr/include/sunpinyin-2.0/lexicon/pytrie.h
/usr/include/sunpinyin-2.0/lexicon/pytrie_gen.h
/usr/include/sunpinyin-2.0/lexicon/trie_writer.h
/usr/include/sunpinyin-2.0/pinyin/
/usr/include/sunpinyin-2.0/pinyin/datrie.h
/usr/include/sunpinyin-2.0/pinyin/datrie_impl.h
/usr/include/sunpinyin-2.0/pinyin/hunpin_seg.h
/usr/include/sunpinyin-2.0/pinyin/pinyin_data.h
/usr/include/sunpinyin-2.0/pinyin/pinyin_seg.h
/usr/include/sunpinyin-2.0/pinyin/quanpin_trie.h
/usr/include/sunpinyin-2.0/pinyin/segmentor.h
/usr/include/sunpinyin-2.0/pinyin/shuangpin_data.h
/usr/include/sunpinyin-2.0/pinyin/shuangpin_seg.h
/usr/include/sunpinyin-2.0/pinyin/syllable.h
/usr/include/sunpinyin-2.0/portability.h
/usr/include/sunpinyin-2.0/slm/ids2ngram/idngram.h
/usr/include/sunpinyin-2.0/slm/ids2ngram/idngram_merge.h
/usr/include/sunpinyin-2.0/slm/sim_dict.h
/usr/include/sunpinyin-2.0/slm/sim_fmerge.h
/usr/include/sunpinyin-2.0/slm/sim_sen.h
/usr/include/sunpinyin-2.0/slm/sim_slm.h
/usr/include/sunpinyin-2.0/slm/slm.h
/usr/include/sunpinyin-2.0/slm/slmbuild/
/usr/include/sunpinyin-2.0/slm/slmbuild/sim_slmbuilder.h
/usr/include/sunpinyin-2.0/slm/slmpack/
/usr/include/sunpinyin-2.0/slm/slmpack/arpa_slm.h
/usr/include/sunpinyin-2.0/slm/slmpack/common.h
/usr/include/sunpinyin-2.0/slm/thread/
/usr/include/sunpinyin-2.0/slm/thread/ValueCompress.h
/usr/include/sunpinyin-2.0/slm/tslmendian/
/usr/include/sunpinyin-2.0/slm/tslmendian/slm_file.h
/usr/include/sunpinyin-2.0/slm/tslmendian/writer.h
/usr/include/sunpinyin-2.0/sunpinyin.h