/usr/lib/x86_64-linux-gnu/pkgconfig/gtk+-x11-2.0.pc is in libgtk2.0-dev 2.24.31-2.
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 15 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
target=x11
gtk_binary_version=2.10.0
gtk_host=x86_64-pc-linux-gnu
Name: GTK+
Description: GTK+ Graphical UI Library (${target} target)
Version: 2.24.31
Requires: gdk-${target}-2.0 atk cairo gdk-pixbuf-2.0 gio-2.0 pangoft2
Libs: -L${libdir} -lgtk-${target}-2.0
Cflags: -I${includedir}/gtk-2.0
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