/usr/include/cld2/internal/ is in libcld2-dev 0.0.0-git20150806-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/cld2/internal/cld2_dynamic_compat.h
/usr/include/cld2/internal/cld2_dynamic_data.h
/usr/include/cld2/internal/cld2_dynamic_data_extractor.h
/usr/include/cld2/internal/cld2_dynamic_data_loader.h
/usr/include/cld2/internal/cld2tablesummary.h
/usr/include/cld2/internal/cldutil.h
/usr/include/cld2/internal/cldutil_offline.h
/usr/include/cld2/internal/cldutil_shared.h
/usr/include/cld2/internal/compact_lang_det_hint_code.h
/usr/include/cld2/internal/compact_lang_det_impl.h
/usr/include/cld2/internal/debug.h
/usr/include/cld2/internal/fixunicodevalue.h
/usr/include/cld2/internal/generated_language.h
/usr/include/cld2/internal/generated_ulscript.h
/usr/include/cld2/internal/getonescriptspan.h
/usr/include/cld2/internal/integral_types.h
/usr/include/cld2/internal/lang_script.h
/usr/include/cld2/internal/langspan.h
/usr/include/cld2/internal/offsetmap.h
/usr/include/cld2/internal/port.h
/usr/include/cld2/internal/scoreonescriptspan.h
/usr/include/cld2/internal/stringpiece.h
/usr/include/cld2/internal/tote.h
/usr/include/cld2/internal/unittest_data.h
/usr/include/cld2/internal/utf8acceptinterchange.h
/usr/include/cld2/internal/utf8prop_lettermarkscriptnum.h
/usr/include/cld2/internal/utf8repl_lettermarklower.h
/usr/include/cld2/internal/utf8scannot_lettermarkspecial.h
/usr/include/cld2/internal/utf8statetable.h