[boost] [Sunpro][regex] Anyone know how to fix this issue?

Does anyone know what would cause: ld: fatal: relocation error: file: /scratch2/kbelco/boost/results/boost/bin.v2/libs/regex/build/sun-5.9/debug/link-static/threading-multi/libboost_regex-sw59-mt-d-1_35.a(posix_api.o) section: .rela.debug_info symbol: : relocation against a discarded symbol, ?symbol is part of discarded section: .text%void boost::re_detail::basic_regex_creator<char,boost::regex_traits<char,boost::cpp_regex_traits<char>

...

::create_startmap(boost::re_detail::re_syntax_base*,unsigned char*,unsigned*,unsigned char)

When trying to build (or use) the regex library on Solaris with Sun-5.9? Annoyingly there are no problems with Sun-5.8, would there be any compiler or linker options that would help here? Many thanks, John.