/usr/lib/pkgconfig/spice-client-gtk-3.0.pc is in libspice-client-gtk-3.0-dev 0.9-0ubuntu1.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: spice-client-gtk-3.0
Description: SPICE Client Gtk 3.0 library
Version: 0.9
Requires: gtk+-3.0 >= 2.91.3 spice-client-glib-2.0
Libs: -L${libdir} -lspice-client-gtk-3.0
Cflags: -I${includedir}/spice-client-gtk-3.0
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