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build error after trying on guide

here is error log

plugin/dedupfs/dedupfs.cc:18:50: error: expected primary-expression before ‘>’ token
   18 |     ObjectLibrary::Default()->Register<FileSystem>("dedupfs",
      |                                                  ^
plugin/dedupfs/dedupfs.cc:18:52: error: left operand of comma operator has no effect [-Werror=unused-value]
   18 |     ObjectLibrary::Default()->Register<FileSystem>("dedupfs",
      |                                                    ^~~~~~~~~
plugin/dedupfs/dedupfs.cc: In function ‘std::unique_ptr<rocksdb::FileSystem> rocksdb::NewDedupFileSystem()’:
plugin/dedupfs/dedupfs.cc:35:48: error: invalid new-expression of abstract class type ‘rocksdb::DedupFileSystem’
   35 |       new DedupFileSystem(FileSystem::Default()));
      |                                                ^
plugin/dedupfs/dedupfs.cc:27:7: note:   because the following virtual functions are pure within ‘rocksdb::DedupFileSystem’:
   27 | class DedupFileSystem : public FileSystemWrapper {
      |       ^~~~~~~~~~~~~~~
In file included from ./include/rocksdb/file_system.h:31,
                 from plugin/dedupfs/dedupfs.h:8,
                 from plugin/dedupfs/dedupfs.cc:6:
./include/rocksdb/customizable.h:61:23: note:     ‘virtual const char* rocksdb::Customizable::Name() const’
   61 |   virtual const char* Name() const = 0;
      |                       ^~~~
cc1plus: all warnings being treated as errors
make: *** [Makefile:2507: plugin/dedupfs/dedupfs.o] Error 1
make: *** Waiting for unfinished jobs....
[root@amd2 rocksdb]#

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