/usr/lib/x86_64-linux-gnu/pkgconfig/champlain-gtk-0.12.pc is in libchamplain-gtk-0.12-dev 0.12.7-0ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libchamplain-gtk
Description: Gtk+ Widget wrapper for libchamplain
Version: 0.12.7
Libs: -L${libdir} -lchamplain-gtk-0.12
Cflags: -I${includedir}/libchamplain-gtk-0.12
Requires: clutter-gtk-1.0 champlain-0.12 gtk+-3.0
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