/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-gtk-1.0.pc is in libclutter-gtk-1.0-dev 1.8.4-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
apiversion=1.0
clutterapiversion=1.0
Name: clutter-gtk
Description: GTK+ integration for Clutter
Version: 1.8.4
Libs: -L${libdir} -lclutter-gtk-${apiversion}
Cflags: -I${includedir}/clutter-gtk-${apiversion}
Requires: clutter-1.0 gtk+-3.0
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