/usr/lib/x86_64-linux-gnu/pkgconfig/gtk+-unix-print-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 14 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
targets=x11
gtk_binary_version=3.0.0
gtk_host=x86_64-pc-linux-gnu
Name: GTK+
Description: GTK+ Unix print support
Version: 3.4.2
Requires: gtk+-3.0 atk cairo cairo-gobject gdk-pixbuf-2.0 gio-2.0
Cflags: -I${includedir}/gtk-3.0/unix-print
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