/usr/lib/x86_64-linux-gnu/pkgconfig/colord-gtk.pc is in libcolord-gtk-dev 0.1.26-2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: colord-gtk
Description: colord-gtk is GTK integration for libcolord
Version: 0.1.26
Requires: colord, gtk+-3.0
Libs: -L${libdir} -lcolord-gtk
Cflags: -I${includedir}/colord-1
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