/usr/lib/x86_64-linux-gnu/pkgconfig/rtmidi.pc is in librtmidi-dev 3.0.0~ds1-2.
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=${prefix}/include/rtmidi
Name: librtmidi
Description: RtMidi - a set of C++ classes that provide a common API for realtime MIDI input/output
Version: 3.0.0
Requires: alsa
Libs: -L${libdir} -lrtmidi
Libs.private: -lpthread
Cflags: -pthread -I${includedir} -D__UNIX_JACK__ -D__LINUX_ALSA__
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