/usr/ is in portaudio19-dev 19.6.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/pa_jack.h
/usr/include/pa_linux_alsa.h
/usr/include/pa_unix_oss.h
/usr/include/portaudio.h
/usr/include/portaudiocpp/
/usr/include/portaudiocpp/AutoSystem.hxx
/usr/include/portaudiocpp/BlockingStream.hxx
/usr/include/portaudiocpp/CFunCallbackStream.hxx
/usr/include/portaudiocpp/CallbackInterface.hxx
/usr/include/portaudiocpp/CallbackStream.hxx
/usr/include/portaudiocpp/CppFunCallbackStream.hxx
/usr/include/portaudiocpp/Device.hxx
/usr/include/portaudiocpp/DirectionSpecificStreamParameters.hxx
/usr/include/portaudiocpp/Exception.hxx
/usr/include/portaudiocpp/HostApi.hxx
/usr/include/portaudiocpp/InterfaceCallbackStream.hxx
/usr/include/portaudiocpp/MemFunCallbackStream.hxx
/usr/include/portaudiocpp/PortAudioCpp.hxx
/usr/include/portaudiocpp/SampleDataFormat.hxx
/usr/include/portaudiocpp/Stream.hxx
/usr/include/portaudiocpp/StreamParameters.hxx
/usr/include/portaudiocpp/System.hxx
/usr/include/portaudiocpp/SystemDeviceIterator.hxx
/usr/include/portaudiocpp/SystemHostApiIterator.hxx
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libportaudio.a
/usr/lib/x86_64-linux-gnu/libportaudiocpp.a
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/portaudio-2.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/portaudiocpp.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/portaudio19-dev/
/usr/share/doc/portaudio19-dev/copyright
/usr/lib/x86_64-linux-gnu/libportaudio.so
/usr/lib/x86_64-linux-gnu/libportaudiocpp.so
/usr/share/doc/portaudio19-dev/changelog.Debian.gz