> Even debian has 1.0.19 in the stable distribution. I think it is
> simpler to just remove the #ifdefs and bump the minimum required
> dependencies.

Another possibility is to avoid the HAVE_LIBSNDFILE directive
replacing it with the check for a constant. Example, in libsnd_u.c:340

#ifdef SF_FORMAT_SD2
      case TYP_SD2:   return "SD2";
#endif
#ifdef SF_FORMAT_FLAC
      case TYP_FLAC:  return "FLAC";
      case TYP_CAF:   return "CAF";
#endif
#ifdef SF_FORMAT_WVE
      case TYP_WVE:   return "WVE";
      case TYP_OGG:   return "OGG";
#endif
#ifdef SF_FORMAT_MPC2K
      case TYP_MPC2K:  return "MPC2K";
      case TYP_RF64:   return "RF64";
#endif
      default:        return Str("unknown");
    }