/usr/lib/x86_64-linux-gnu/pkgconfig/mpack.pc is in libmpack-dev 1.0.5-2.
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 | libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
version=1.0.3
Name: mpack
Description: small binary serialization library implementing msgpack and msgpack-rpc formats
Version: ${version}
Libs: -L${libdir} -lmpack
Cflags: -I${includedir}
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