https://github.com/protobuf-c/protobuf-c/pull/673

Index: protoc-c/c_file.h
--- protoc-c/c_file.h.orig
+++ protoc-c/c_file.h
@@ -103,8 +103,6 @@ class FileGenerator {
   std::unique_ptr<std::unique_ptr<EnumGenerator>[]> enum_generators_;
   std::unique_ptr<std::unique_ptr<ServiceGenerator>[]> service_generators_;
   std::unique_ptr<std::unique_ptr<ExtensionGenerator>[]> extension_generators_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileGenerator);
 };
 
 }  // namespace c