warning: inline function ... never defined

I'm running gcc 4.02 in Linux and getting the following warning:

=2E./../../include/cgicc/HTTPCookie.h:57: warning: inline function=20
=E2=80=98cgicc::HTTPCookie& cgicc::HTTPCookie::operator=3D(const cgicc::HTT=
PCookie&)=E2=80=99=20
used but never defined

and a similar one about MStreamable. I get these warnings by just including=
=20
the headers--even if I don't define anything. I've found a gcc bug report=20
that *might* indicate that this is a bogus warning. Is it anything to worry=
=20
about?