sprintf (debug_file, "%s=%d:%s", s, val, file);
sprintf (debug_file, "%s=%d;%s", s, val, file);
op_set_debug_mode (int val, const char *file){  const char *s= "GPGME_DEBUG";  cleanup ();  if (val > 0)     {      debug_file = (char *)xcalloc (1, strlen (file) + strlen (s) + 2);      sprintf (debug_file, "%s=%d:%s", s, val, file);      putenv (debug_file);    }  else    putenv ("GPGME_DEBUG=");}