"^" under boost during installation on Linux CentOS

Dear Expert,

I install boost into my directy with the following linux Centos command

tar xvzf boost_1_50_0.tar.gz
cd boost_1_50_0
./bootstrap.sh --prefix=../local --libdir=../local/lib
./bjam --layout=system install
export Boost_LIBRARYDIR=../local/include/boost/
cd ..

During installation, it will echo a lot of response from the shell as follows in code area
There is a lot character of "^"  under the character b of boost.
What is that meaning ? Is it installation error mesage ?
Do I need take care of those response ?

And last question why it took almost 1hour to finish boost installation. Is it normal
installation time?

Please advise and appreciated your help

Duncan

./boost/spirit/home/classic/phoenix/tuple_helpers.hpp: In function ‘TupleResultT phoenix::convert_actors(const ActorTupleT&)’:
./boost/static_assert.hpp:125:21: warning: typedef ‘boost_static_assert_typedef_509’ locally defined but not used [-Wunused-local-typedefs]
          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
                     ^
./boost/spirit/home/classic/phoenix/tuple_helpers.hpp:509:5: note: in expansion of macro ‘BOOST_STATIC_ASSERT’
     BOOST_STATIC_ASSERT(ActorTupleT::length <= TupleResultT::length);
     ^
./boost/spirit/home/classic/phoenix/tuple_helpers.hpp: In static member function ‘static phoenix::impl::convert_actor<N, TupleResultT, ActorTupleT>::type phoenix::impl::convert_actor<N, TupleResultT, ActorTupleT>::actor_element(const ActorTupleT&, phoenix::impl::convert_actor<N, TupleResultT, ActorTupleT>::is_not_default)’:
./boost/static_assert.hpp:125:21: warning: typedef ‘boost_static_assert_typedef_536’ locally defined but not used [-Wunused-local-typedefs]
          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
                     ^
./boost/spirit/home/classic/phoenix/tuple_helpers.hpp:536:13: note: in expansion of macro ‘BOOST_STATIC_ASSERT’
             BOOST_STATIC_ASSERT(ActorTupleT::length <= TupleResultT::length);
             ^
./boost/wave/grammars/cpp_chlit_grammar.hpp: In member function ‘void boost::wave::grammars::impl::compose_character_literal::operator()(uint32_t&, bool, bool&, uint32_t) const’:
./boost/static_assert.hpp:125:21: warning: typedef ‘boost_static_assert_typedef_85’ locally defined but not used [-Wunused-local-typedefs]
          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)

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