/usr/include/speech_tools/instantiate/ is in libestools2.1-dev 1:2.1~release-6.
This file is owned by root:root, with mode 0o755.
..
/usr/include/speech_tools/instantiate/EST_TDequeI.h
/usr/include/speech_tools/instantiate/EST_THashI.h
/usr/include/speech_tools/instantiate/EST_TIteratorI.h
/usr/include/speech_tools/instantiate/EST_TKVLI.h
/usr/include/speech_tools/instantiate/EST_TListI.h
/usr/include/speech_tools/instantiate/EST_TMatrixI.h
/usr/include/speech_tools/instantiate/EST_TNamedEnumI.h
/usr/include/speech_tools/instantiate/EST_TSimpleMatrixI.h
/usr/include/speech_tools/instantiate/EST_TSimpleVectorI.h
/usr/include/speech_tools/instantiate/EST_TSortableI.h
/usr/include/speech_tools/instantiate/EST_TStringHashI.h
/usr/include/speech_tools/instantiate/EST_TVectorI.h