/usr/lib/x86_64-linux-gnu/pkgconfig/gnome-keyring-1.pc is in libgnome-keyring-dev 3.12.0-1+b1.
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=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: gnome-keyring
Description: The GNOME keyring libraries
Version: 3.12.0
Requires: glib-2.0
Libs: -L${libdir} -lgnome-keyring
Cflags: -I${includedir}/gnome-keyring-1
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