Since version 6.0.0, the package name is updated to msgpack-cxx. See https://github.com/msgpack/msgpack-c/releases/tag/cpp-6.0.0
msgpack-cxx
If you want to suppport both 5.x and 6.x, you can write your CMakeLists.txt as follows:
find_package(msgpackc-cxx QUIET CONFIG NAMES msgpackc-cxx msgpack) if(msgpackc-cxx_FOUND) add_library(msgpack-cxx ALIAS msgpackc-cxx) else() find_package(msgpack-cxx CONFIG REQUIRED) endif()
See also #1079
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