/usr/lib/x86_64-linux-gnu/pkgconfig/ is in libradare2-dev 0.9.6-3.1+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/r_cons.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_lib.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_lang.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_cmd.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_util.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_fs.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_anal.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_debug.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_asm.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_db.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_diff.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_search.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_socket.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_magic.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_flags.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_reg.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_io.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_bp.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_sign.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_config.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_hash.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_syscall.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_core.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_bin.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/r_parse.pc