linking question

[n t]

What does this message mean?
-------------------------------------------------
Unresolved:
std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <char,
std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char>
>&, std::_Setw)
collect2: ld returned 1 exit status
*** Exit 1
Stop.
-------------------------------------------------

I did not have this error message when I compiled and
link using g++ version 2.95.3.  Now with the move to
g++ 3.0.2, I see this error.  Is it really an error? 
These are the flags the files were compiled and linked
with:
g++ -Wall -g -fno-implicit-templates
-ftemplate-depth-28

Thank you,
nt.

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