pbmserv C++ problem

[Scott Huddleston <scotth@co.intel.com>]

Some of the pbmserv game engines don't compile under my C++.  I know
basic C++, but I'm not a C++ wizard.

Can anyone tell what the following problem is and how to fix it?

---------- when compiling renju_main.cpp: ----------------------
"renju_main.cpp", line 3: error: inherited member is not allowed
  const char *Renju::Cols = "abcdefghjklmnop";
                     ^

---------- this intends to inherit from here in gomoku.h ------------

class Gomoku: public Board2D {
protected:
        Last last;
        static const char *Cols;
public:
....

Thanks,
- Scott