/usr/lib/x86_64-linux-gnu/pkgconfig/json-glib-1.0.pc is in libjson-glib-dev 1.1.2-0ubuntu1.
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=${prefix}/include
Name: JSON-GLib
Description: JSON Parser for GLib
Version: 1.1.2
Libs: -L${libdir} -ljson-glib-1.0
Cflags: -I${includedir}/json-glib-1.0
Requires: gobject-2.0 gio-2.0
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