aRead");  #if !HAVE_LIBPNG     /* defined in environ.h and config_auto.h */     return (PIXAA *)ERROR_PTR("no libpng: can't read data", procName, NULL); #endif  /* !HAVE_LIBPNG */      if (!filename)         return (PIXAA *)ERROR_PTR("filename not defined", procName, NULL);      if ((fp = fopenReadStream(filename)) == NULL)         return (PIXAA *)ERROR_PTR("stream not opened", procName, NULL);     paa = pixaaReadStream(fp);     fclose(fp);     if (!paa) 