/usr/lib/speech_tools/lib/libestbase.a is in libestools-dev 1:2.4~release-5+b3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/speech_tools/lib/../../x86_64-linux-gnu/libestbase.a
/usr/lib/speech_tools/lib/../../x86_64-linux-gnu/libestbase.a