/usr/include/svxlink/ is in libasyncaudio-dev 17.12.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/svxlink/AsyncAudioAmp.h
/usr/include/svxlink/AsyncAudioClipper.h
/usr/include/svxlink/AsyncAudioCompressor.h
/usr/include/svxlink/AsyncAudioDebugger.h
/usr/include/svxlink/AsyncAudioDecimator.h
/usr/include/svxlink/AsyncAudioDecoder.h
/usr/include/svxlink/AsyncAudioDelayLine.h
/usr/include/svxlink/AsyncAudioDevice.h
/usr/include/svxlink/AsyncAudioDeviceFactory.h
/usr/include/svxlink/AsyncAudioEncoder.h
/usr/include/svxlink/AsyncAudioFifo.h
/usr/include/svxlink/AsyncAudioFilter.h
/usr/include/svxlink/AsyncAudioGenerator.h
/usr/include/svxlink/AsyncAudioIO.h
/usr/include/svxlink/AsyncAudioInterpolator.h
/usr/include/svxlink/AsyncAudioJitterFifo.h
/usr/include/svxlink/AsyncAudioMixer.h
/usr/include/svxlink/AsyncAudioNoiseAdder.h
/usr/include/svxlink/AsyncAudioPacer.h
/usr/include/svxlink/AsyncAudioPassthrough.h
/usr/include/svxlink/AsyncAudioProcessor.h
/usr/include/svxlink/AsyncAudioReader.h
/usr/include/svxlink/AsyncAudioRecorder.h
/usr/include/svxlink/AsyncAudioSelector.h
/usr/include/svxlink/AsyncAudioSink.h
/usr/include/svxlink/AsyncAudioSource.h
/usr/include/svxlink/AsyncAudioSplitter.h
/usr/include/svxlink/AsyncAudioStreamStateDetector.h
/usr/include/svxlink/AsyncAudioValve.h
/usr/include/svxlink/AsyncSigCAudioSink.h
/usr/include/svxlink/AsyncSigCAudioSource.h