This a recipe to build and package msgpack for C on Cygwin. The recipe is based on the recipe in cascent's old neovim port.
To build the package run the following command:
cygport msgpack-c-cygwin.cygport download prepare compile install package
To install the package you can extract it into the root directory:
eval "$(cygport msgpack-c.cygport vars PVR)"
tar -C / -xjvf msgpack-c-$PVR.x86_64/dist/msgpack-c/libmsgpack2-$PVR.tar.xz