In a header file of your C/C++ application or extension that
includes the Tk library, add these lines:

  #include <tcl.h>
  ...
  #if (TK_MAJOR_VERSION < 8)
  #define Tk_SafeInit ((Tcl_PackageInitProc *) NULL)
  #endif

Why?  Now your code can safely include the initialization
sequence:

  if (Tk_Init(interp) == TCL_ERROR) {
      return TCL_ERROR;
  }
  Tcl_StaticPackage(interp, "Tk", Tk_Init, Tk_SafeInit);

without worrying about what versions of Tk do and do not
define Tk_SafeInit().

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%| [Category Porting] |%
!!!!!!