/usr/lib/x86_64-linux-gnu/pkgconfig/webrtc-audio-processing.pc is in libwebrtc-audio-processing-dev 0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: webrtc-audio-processing
Description: WebRTC Audio Processing library
Version: 0.3
Libs: -L${libdir} -lwebrtc_audio_processing
Cflags: -DWEBRTC_AUDIO_PROCESSING_ONLY_BUILD -I${includedir}/webrtc_audio_processing -DWEBRTC_POSIX
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