problem using a custom exception class

[Jeffrey Holle <jeff dot holle at verizon dot net>]

I'm using gcc v3.4.1.

I've a custom exception class which I'm using in a library that compiles 
  without any compiler errors/warnings.

When I attempt to use this library, I get:
  : undefined reference to `typeinfo for attribute_error'


My custom exception class, modeled using info from stdexcept, is:

class attribute_error : public std::exception
{
public:
  explicit attribute_error(const std::string& attributeName) throw(); 
// used for missing attribute
  explicit attribute_error(const std::string& attributeName, const 
std::string& msg) throw();
  virtual ~attribute_error() throw() {}
  virtual const char* what() const throw();
private:
  std::string msg_;
};


Can someone point me to how to fix this?