/usr/lib/x86_64-linux-gnu/pkgconfig/unity-gtk3-parser.pc is in libunity-gtk3-parser-dev 0.0.0+15.04.20150118-0ubuntu2.
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=${prefix}/include
Name: unity-gtk3-parser
Description: GtkMenuShell to GMenuModel parser
Version: 0.0.0
Requires: gtk+-3.0
Cflags: -I${includedir}/unity-gtk-parser
Libs: -L${libdir} -lunity-gtk3-parser
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