when i build 5.4 in the ubuntu 14.04 show this error- - !g++ -O2 -msse2 -pthread -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter -DBOOST_SPIRIT_THREADSAFE -I/home/CACHeCoin/src -I/home/CACHeCoin/src/obj -DUSE_UPNP=0 -DUSE_IPV6=1 -DSCRYPT_KECCAK512 -DSCRYPT_CHACHA -DSCRYPT_CHOOSE_COMPILETIME -DHAVE_BUILD_INFO -fno-stack-protector -fstack-protector-all -Wstack-protector -D_FORTIFY_SOURCE=2 -o cachecoind obj/alert.o obj/version.o obj/checkpoints.o obj/netbase.o obj/addrman.o obj/crypter.o obj/key.o obj/db.o obj/init.o obj/irc.o obj/keystore.o obj/main.o obj/net.o obj/protocol.o obj/bitcoinrpc.o obj/rpcdump.o obj/rpcnet.o obj/rpcmining.o obj/rpcwallet.o obj/rpcblockchain.o obj/rpcrawtransaction.o obj/script.o obj/sync.o obj/util.o obj/wallet.o obj/walletdb.o obj/noui.o obj/kernel.o obj/pbkdf2.o obj/scrypt_mine.o obj/scrypt-x86.o obj/scrypt-x86_64.o obj/scrypt-jane.o -Wl,-z,relro -Wl,-z,now -Wl,-Bdynamic -l boost_system -l boost_filesystem -l boost_program_options -l boost_thread -l db_cxx -l ssl -l crypto -l miniupnpc -Wl,-Bdynamic -l z -l dl -l pthread
obj/walletdb.o: In function `BackupWallet(CWallet const&, std::string const&)':
walletdb.cpp:(.text+0x283d): undefined reference to `boost::filesystem::detail::copy_file(boost::filesystem::path const&, boost::filesystem::path const&, boost::filesystem::detail::copy_option, boost::system::error_code*)'
collect2: error: ld returned 1 exit status
make: *** [cachecoind] Error 1
what happend - -! 5.3 is fine!!
