/usr/lib/x86_64-linux-gnu/pkgconfig/unity-protocol-private.pc is in libunity-dev 7.1.4+14.04.20140210-0ubuntu1.
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=${prefix}/include
Name: libunity-protocol-private
Description: Library defining the dbus signatures and interfaces for libunity
Version: 7.1.4
Libs: -L${libdir}/libunity -lunity-protocol-private
Cflags: -I${includedir}/unity/unity
Requires: glib-2.0 gobject-2.0 gio-2.0 dee-1.0
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