/usr/lib/x86_64-linux-gnu/pkgconfig/rtaudio.pc is in librtaudio-dev 4.1.2~ds0-4.
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 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include/rtaudio
Name: librtaudio
Description: RtAudio - a set of C++ classes that provide a common API for realtime audio input/output
Version: 4.1.2
Requires: alsa libpulse-simple
Libs: -L${libdir} -lrtaudio
Libs.private: -lpthread
Cflags: -pthread -I${includedir}
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