aReadStream");  #if !HAVE_LIBPNG     /* defined in environ.h and config_auto.h */     return (PIXA *)ERROR_PTR("no libpng: can't read data", procName, NULL); #endif  /* !HAVE_LIBPNG */      if (!fp)         return (PIXA *)ERROR_PTR("stream not defined", procName, NULL);      if (fscanf(fp, "\nPixa Version %d\n", &version) != 0)         return (PIXA *)ERROR_PTR("not a pixa file", procName, NULL);     