/usr/lib/x86_64-linux-gnu/pkgconfig/cinnamon-settings-daemon.pc is in cinnamon-settings-daemon-dev 3.6.2-1.
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 | prefix=/usr
includedir=${prefix}/include
Name: cinnamon-settings-daemon
Description: cinnamon-settings-daemon specific enumarations
Requires: glib-2.0
Version: 3.6.2
Cflags: -I${includedir}/cinnamon-settings-daemon-3.0
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