Currently, two of the string tests fail to compile with the following error: cxx: Error: /vol2/boost/boost/boost/algorithm/string/detail/finder.hpp, line 412: #20 identifier "find_tail_impl" is undefined detected during: instantiation of "boost::iterator_range<Iterator> boost::algorithm::detail::head_finderF::operator()(Forwar dIteratorT, ForwardIteratorT) const [with ForwardIteratorT=char *]" at line 254 of "/vol2/boost/boost/boost/algorithm/string/find.hpp" instantiation of "boost::iterator_range<boost::range_result_iterator<C>::t ype> boost::algorithm::find_head(RangeT &, int) [with RangeT=std::string]" at line 129 of "../libs/algorithm/string/test/find_test.cpp" find_tail_impl( Begin, End, -m_N ); Looking the the code in question (struct head_finderF::operator()) it contains the following on line 412: iterator_range<ForwardIteratorT> Res = find_tail_impl( Begin, End, -m_N ); But find_tail_impl() is not declared until line 486 in the same file. Added the following declaration template <typename ForwardIteratorT> iterator_range<ForwardIteratorT> find_tail_impl( ForwardIteratorT Begin, ForwardIteratorT End, unsigned int N); at line 394, just before the definition of struct head_finderF makes the tests compile and pass ok. I have to admit I'm not sure that the compiler is right to complain about this, but it seems reasonable to me. So could the declaration of find_tail_impl please be added to the file somewhere before it's first used. TIA, Markus