you can find rgdal here http://www.kyngchaos.com/wiki/doku.php?id=software:frameworks
Once that is installed you should be able to use spgrass6 without problems. I've been using it on my mac for quite some time.
Ken _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
