Compiler error for tokenizer on Solaris

[stosys]

When trying to upgrade to boost 1_31, Forte 8.0 (CC: 
Sun C++ 5.5 Patch 113817-03
2003/10/14) gives the following error for the code snip:

typedef boost::tokenizer<boost::char_separator<char> 
> tokenizer;
boost::char_separator<char> seperator
(sDroppedDelimiters, sKeptDelimiters, 
boost::keep_empty_tokens);
tokenizer tokens( sString, seperator );
for (tokenizer::iterator tok_iter = tokens.begin(); 
tok_iter != tokens.end(); ++tok_iter)
     vInVector.push_back( *tok_iter );

Copiler error:
"/home/dev/cm/THIRD_PARTY/boost/include/boost/iterat
or/iterator_facade.hpp",
line 623: Error: Could not find a match for
boost::iterator_core_access::equal<boost::iterator_core
_access::Facade1,
boost::iterator_core_access::Facade2>(const
boost::token_iterator<boost::char_separator<char, 
std::char_traits<char>>,
const char*, std::string>, const
boost::token_iterator<boost::char_separator<char, 
std::char_traits<char>>,
const char*, std::string>,
boost::is_convertible<boost::token_iterator<boost::char
_separator<char,
std::char_traits<char>>, const char*, std::string>,
boost::token_iterator<boost::char_separator<char, 
std::char_traits<char>>,
const char*, std::string>>).

"MDSStringHelpers.cxx", line 183:     Where: While 
instantiating
"boost::operator!
=<boost::token_iterator<boost::char_separator<char,
std::char_traits<char>>, const char*, std::string>, 
std::string,boost::forward_traversal_tag, const 
std::string &, int,
boost::token_iterator<boost::char_separator<char, 
std::char_traits<char>>,
const char*, std::string>, std::string, 
boost::forward_traversal_tag,
const std::string &, int>(const
boost::iterator_facade<boost::token_iterator<boost::cha
r_separator<char,
std::char_traits<char>>, const char*, std::string>, 
std::string,
boost::forward_traversal_tag, const std::string &, 
int>&, const
boost::iterator_facade<boost::token_iterator<boost::cha
r_separator<char,
std::char_traits<char>>, const char*, std::string>, 
std::string,
boost::forward_traversal_tag, const std::string &, 
int>&)".

"MDSStringHelpers.cxx", line 183:     Where: Instantiated 
from
non-template code.

Has anyone else complianed about this?

Thanks
Tom