make have error
obj/txdb-leveldb.o: In function `bool CTxDB::Write, std::allocator >, std::__cxx11::basic_string, std::allocator > >(std::__cxx11::basic_string, std::allocator > const&, std::__cxx11::basic_string, std::allocator > const&)':
/home/****/compil/UDOWNcoin/src/txdb-leveldb.h:119: undefined reference to `leveldb::Status::ToString[abi:cxx11]() const'
obj/txdb-leveldb.o:/home/****/compil/UDOWNcoin/src/txdb-leveldb.h:84: more undefined references to `leveldb::Status::ToString[abi:cxx11]() const' follow
collect2: error: ld returned 1 exit status
makefile.unix:189: recipe for target 'UDOWNcoind' failed
make: *** [UDOWNcoind] Error 1
how fix it ubunut 16.04?
sudo git clone
https://github.com/freddumo/UDOWNcoin.gitcd UDOWNcoin/src/leveldb
sudo chmod 755 build_detect_platform
sudo make libleveldb.a libmemenv.a
cd ..
sudo make -f makefile.unix
cd UDOWNcoin/src
sudo ./UDOWNcoind
sudo ./UDOWNcoind stop