/usr/lib/x86_64-linux-gnu/pkgconfig/gtk-engines-2.pc is in gtk2-engines 1:2.20.2-5.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: gtk-engines-2
Description: GTK+ Theme Engines
Version: 2.20.2
Requires: gtk+-2.0
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