/usr/include/speech_tools/base_class/ is in libestools2.1-dev 1:2.1~release-6.
This file is owned by root:root, with mode 0o755.
..
/usr/include/speech_tools/base_class/EST_Complex.cc
/usr/include/speech_tools/base_class/EST_DMatrix.cc
/usr/include/speech_tools/base_class/EST_FMatrix.cc
/usr/include/speech_tools/base_class/EST_FeatureData.cc
/usr/include/speech_tools/base_class/EST_Featured.cc
/usr/include/speech_tools/base_class/EST_Features.cc
/usr/include/speech_tools/base_class/EST_IMatrix.cc
/usr/include/speech_tools/base_class/EST_Option.cc
/usr/include/speech_tools/base_class/EST_Pathname_unix.cc
/usr/include/speech_tools/base_class/EST_Pathname_win32.cc
/usr/include/speech_tools/base_class/EST_SMatrix.cc
/usr/include/speech_tools/base_class/EST_StringTrie.cc
/usr/include/speech_tools/base_class/EST_TBuffer.cc
/usr/include/speech_tools/base_class/EST_TDeque.cc
/usr/include/speech_tools/base_class/EST_THash.cc
/usr/include/speech_tools/base_class/EST_TKVL.cc
/usr/include/speech_tools/base_class/EST_TList.cc
/usr/include/speech_tools/base_class/EST_TMatrix.cc
/usr/include/speech_tools/base_class/EST_TNamedEnum.cc
/usr/include/speech_tools/base_class/EST_TSimpleMatrix.cc
/usr/include/speech_tools/base_class/EST_TSimpleVector.cc
/usr/include/speech_tools/base_class/EST_TSortable.cc
/usr/include/speech_tools/base_class/EST_TTimeIndex.cc
/usr/include/speech_tools/base_class/EST_TVector.cc
/usr/include/speech_tools/base_class/EST_Token.cc
/usr/include/speech_tools/base_class/EST_Tvectlist.cc
/usr/include/speech_tools/base_class/EST_UList.cc
/usr/include/speech_tools/base_class/EST_Val.cc
/usr/include/speech_tools/base_class/EST_features_aux.cc
/usr/include/speech_tools/base_class/EST_features_io.cc
/usr/include/speech_tools/base_class/EST_ilist_aux.cc
/usr/include/speech_tools/base_class/EST_matrix_support.cc
/usr/include/speech_tools/base_class/EST_slist_aux.cc
/usr/include/speech_tools/base_class/EST_svec_aux.cc
/usr/include/speech_tools/base_class/THash_aux.cc
/usr/include/speech_tools/base_class/rateconv.cc
/usr/include/speech_tools/base_class/vec_mat_aux.cc
/usr/include/speech_tools/base_class/vec_mat_aux_d.cc
/usr/include/speech_tools/base_class/vec_mat_aux_i.cc