build: Detect libmsgpack as msgpack-c

The pc file is called differently on Ubuntu than on Arch Linux

Signed-off-by: Arian van Putten <[email protected]>

Author: arianvp

CMakeLists.txt

@@ -543,7 +543,11 @@ add_subdirectory(${FLB_PATH_LIB_FLUENT_OTEL} EXCLUDE_FROM_ALL)
 # MsgPack options
 if(FLB_PREFER_SYSTEM_LIB_MSGPACK)
   find_package(PkgConfig)
+  # Try msgpack first (Ubuntu/Debian), then msgpack-c (Arch Linux)
   pkg_check_modules(MSGPACK msgpack>=4.0.0)
+  if(NOT MSGPACK_FOUND)
+    pkg_check_modules(MSGPACK msgpack-c>=4.0.0)
+  endif()
 endif()
 if(MSGPACK_FOUND)
   include_directories(${MSGPACK_INCLUDE_DIRS})