int Perl_flex_stat (pTHX_ const char *, Stat_t *);
int my_vfork (void);
bool Perl_vms_do_exec (pTHX_ const char *);
-unsigned long int Perl_do_aspawn (pTHX_ void *, void **, void **);
-unsigned long int Perl_do_spawn (pTHX_ const char *);
FILE * my_fdopen (int, const char *);
int my_fclose (FILE *);
int my_fwrite (const void *, size_t, size_t, FILE *);