size_t strxfrm( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
{
- _PDCLIB_ctype_t *ctype = _PDCLIB_threadlocale()->_CType;
+ const _PDCLIB_ctype_t *ctype = _PDCLIB_threadlocale()->_CType;
size_t len = strlen( s2 );
if ( len < n )
{