/usr/lib/pkgconfig/guile-gnome-gtk-2.pc is in guile-gnome2-dev 2.16.2-1.1ubuntu1.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
Name: (gnome gtk)
Description: Guile bindings for Gtk+
Requires: guile-gnome-glib-2 guile-cairo
Version: 2.16.2
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