/usr/lib/x86_64-linux-gnu/pkgconfig/rtmidi.pc is in librtmidi-dev 2.0.1~ds0-3ubuntu1.
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 13 14 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: rtmidi
Description: Library for realtime MIDI input/output
Version: 2.0.1
URL: http://www.music.mcgill.ca/~gary/rtmidi/index.html
Requires: jack
Conflicts:
Libs: -L${libdir} -lrtmidi
Libs.private:
Cflags: -D__UNIX_JACK__ -D__LINUX_ALSA__
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