/usr/lib/x86_64-linux-gnu/pkgconfig/gdk-x11-3.0.pc is in libgtk-3-dev 3.4.2-0ubuntu0.9.
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 13 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
targets=x11
Name: GDK
Description: GTK+ Drawing Kit
Version: 3.4.2
Requires: pango pangocairo gdk-pixbuf-2.0 cairo cairo-gobject
Requires.private: gio-unix-2.0 fontconfig x11 xext xinerama xi xrandr xcursor xfixes xcomposite xdamage cairo-xlib pangoft2
Libs: -L${libdir} -lgdk-3
Cflags: -I${includedir}/gtk-3.0
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