C++ __COUNTER__ Definition

I have two versions of a c++ compiler installed on my computer. One of them recognizes the __COUNTER__ macro and the other does not. After doing some research to make the program compile in both I have yet to come across the Macro definition for __COUNTER__. Is this some special Macro done by the compiler or can I copy the definition for __COUNTER__ into my source code, if I can copy it what is the code I need.