/usr/lib/x86_64-linux-gnu/libportaudiocpp.so is in portaudio19-dev 19+svn20111121-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libportaudiocpp.so.0.0.12
/usr/lib/x86_64-linux-gnu/libportaudiocpp.so.0.0.12