# define XS_VERSION_BOOTCHECK \
STMT_START { \
SV *_sv; STRLEN n_a; \
- char *vn = Nullch, *module = SvPV(ST(0),n_a); \
+ const char *vn = Nullch, *module = SvPV(ST(0),n_a); \
if (items >= 2) /* version supplied as bootstrap arg */ \
_sv = ST(1); \
else { \