kou commented on issue #41333:
URL: https://github.com/apache/arrow/issues/41333#issuecomment-2073685087
For MSYS2: My guess was wrong. The Protobuf CMake "Module"
(`FindProtobuf.cmake`) not "Config" (`protobuf-config.cmake') was used. I don't
know why our CI uses "Config" not "Module" but this may fix this:
```diff
diff --git a/cpp/cmake_modules/FindProtobufAlt.cmake
b/cpp/cmake_modules/FindProtobufAlt.cmake
index 15fe1b4f27..ef3b1219e1 100644
--- a/cpp/cmake_modules/FindProtobufAlt.cmake
+++ b/cpp/cmake_modules/FindProtobufAlt.cmake
@@ -28,8 +28,12 @@ endif()
if(ProtobufAlt_FIND_QUIETLY)
list(APPEND find_package_args QUIET)
endif()
-find_package(Protobuf ${find_package_args})
-set(ProtobufAlt_FOUND ${Protobuf_FOUND})
+find_package(protobuf CONFIG ${find_package_args})
+set(ProtobufAlt_FOUND ${protobuf_FOUND})
+if(NOT ProtobufAlt_FOUND)
+ find_package(Protobuf ${find_package_args})
+ set(ProtobufAlt_FOUND ${Protobuf_FOUND})
+endif()
if(ProtobufAlt_FOUND)
set(ProtobufAlt_VERSION ${Protobuf_VERSION})
set(ProtobufAlt_VERSION_MAJOR ${Protobuf_VERSION_MAJOR})
```
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