Failed to compile boost.serialization

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Boost

Hi,
There are link errors when I compile a simple demo.

In function `boost::archive::text_oarchive::text_oarchive(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)':
demo.cpp:(.text._ZN5boost7archive13text_oarchiveC2ERSoj[_ZN5boost7archive13text_oarchiveC5ERSoj]+0x25): undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)'

I checked boost's source and find that the constructor of text_oarchive_impl text_oarchive_impl(std::ostream & os, unsigned int flags) has no implementation in text_oarchive.hpp. Or is there any libraries I should have to link.

I find implementations in boost/archive/impl/text_oarchive_impl.ipp. What's the meaning of suffix .ipp ?

Thanks for your attention.