Errors when cross compiling C  /Objective-C
Undefined symbols for architecture i386:
  "std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
      __verify_callback_c in *************.a(cxx_db.o)
      DbEnv::_stream_message_function(__db_env const*, char const*) in *************.a(cxx_env.o)
      DbEnv::_stream_error_function(__db_env const*, char const*, char const*) in *************.a(cxx_env.o)
  "std::basic_ios<char, std::char_traits<char> >::fail() const", referenced from:
      __verify_callback_c in *************.a(cxx_db.o)
  "std::ios_base::Init::Init()", referenced from:
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_db.o)
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_dbc.o)
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_dbt.o)
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_env.o)
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_mpool.o)
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_txn.o)
      __static_initialization_and_destruction_0(int, int) in *************.a(cxx_lock.o)
      ...
  "std::ios_base::Init::~Init()", referenced from:
      ___tcf_0 in *************.a(cxx_db.o)
      ___tcf_0 in *************.a(cxx_dbc.o)
      ___tcf_0 in *************.a(cxx_dbt.o)
      ___tcf_0 in *************.a(cxx_env.o)
      ___tcf_0 in *************.a(cxx_mpool.o)
      ___tcf_0 in *************.a(cxx_txn.o)
      ___tcf_0 in *************.a(cxx_lock.o)
      ...
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Build Settings:
C++ Standard Library = libc++
C++ Language Dialect = c++0x