/usr/lib/x86_64-linux-gnu/pkgconfig/cinnamon-desktop.pc is in libcinnamon-desktop-dev 2.8.0-1.
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 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: cinnamon-desktop
Description: Utility library for loading .desktop files
Requires: gtk+-3.0
Requires.private: xkbfile
Version: 2.8.0
Libs: -L${libdir} -lcinnamon-desktop
Cflags: -I${includedir}/cinnamon-desktop
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