error :/ help?

leveldb/util/logging.cc:58:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
           (v == kMaxUint64/10 && delta > kMaxUint64%10)) {
                                        ^
  CXX      leveldb/util/leveldb_libleveldb_a-options.o
  CXX      leveldb/util/leveldb_libleveldb_a-status.o
  CXX      leveldb/port/leveldb_libleveldb_a-port_posix.o
  AR       leveldb/libleveldb.a
/usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
  CXX      leveldb/helpers/memenv/leveldb_libmemenv_a-memenv.o
  AR       leveldb/libmemenv.a
/usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    hppcoind
  CXX      hppcoin_cli-bitcoin-cli.o
  CXX      rpc/libbitcoin_cli_a-client.o
  AR       libbitcoin_cli.a
/usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    hppcoin-cli
  CXX      hppcoin_tx-bitcoin-tx.o
  CXXLD    hppcoin-tx
  GEN      qt/bitcoin.moc
  GEN      qt/bitcoinamountfield.moc
  GEN      qt/intro.moc
  GEN      qt/overviewpage.moc
  CXX      qt/qt_hppcoin_qt-bitcoin.o
In file included from qt/paymentrequestplus.h:8:0,
                 from qt/paymentserver.h:35,
                 from qt/bitcoin.cpp:24:
qt/paymentrequest.pb.h:12:2: error: #error This file was generated by a newer version of protoc which is
 #error This file was generated by a newer version of protoc which is
  ^
qt/paymentrequest.pb.h:13:2: error: #error incompatible with your Protocol Buffer headers. Please update
 #error incompatible with your Protocol Buffer headers.  Please update
  ^
qt/paymentrequest.pb.h:14:2: error: #error your headers.
 #error your headers.
  ^
In file included from qt/paymentrequestplus.h:8:0,
                 from qt/paymentserver.h:35,
                 from qt/bitcoin.cpp:24:
qt/paymentrequest.pb.h:23:35: fatal error: google/protobuf/arena.h: No such file or directory
compilation terminated.
Makefile:7171: recipe for target 'qt/qt_hppcoin_qt-bitcoin.o' failed
make[2]: *** [qt/qt_hppcoin_qt-bitcoin.o] Error 1
make[2]: Leaving directory '/home/cryptominer/hppcoin/src'
Makefile:7293: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/cryptominer/hppcoin/src'
Makefile:684: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1