# elif defined(__GNUC__) && (__GNUC__ > 2)
#   define TCL_UNUSED(T) T JOIN(dummy, __LINE__) __attribute__((unused))
# else
#   define TCL_UNUSED(T) T JOIN(dummy, __LINE__)
# endif
#endif

#if (TCL_MAJOR_VERSION < 9) && defined(TCL_MINOR_VERSION) && (TCL_MINOR_VERSION < 7) && !defined(Tcl_Size)
#if (TCL_MAJOR_VERSION < 9) && defined(TCL_MINOR_VERSION) && (TCL_MINOR_VERSION < 7) && !defined(TCL_SIZE_MODIFIER)
#   define Tcl_Size int
#   define TCL_SIZE_MODIFIER ""
#endif

/*
 * Forward declarations
 */
const Tcl_ChannelType *Tls_ChannelType(void);