#define PL_perlio_fd_refcnt_size (*Perl_Gperlio_fd_refcnt_size_ptr(NULL))
#undef PL_perlio_mutex
#define PL_perlio_mutex (*Perl_Gperlio_mutex_ptr(NULL))
#define PL_perlio_fd_refcnt_size (*Perl_Gperlio_fd_refcnt_size_ptr(NULL))
#undef PL_perlio_mutex
#define PL_perlio_mutex (*Perl_Gperlio_mutex_ptr(NULL))