determining the exact variants that got installed

[Jeremy Lavergne]

> $port installed gdal
> The following ports are currently installed:
>  gdal @1.8.0_0+expat
>  gdal @1.8.0_1+curl+expat+geos+netcdf+postgresql90+python27+spatialite+sqlite3 (active)
>  gdal @1.8.0_1+expat
> 
> 
> So, it seems I have multiple versions of gdal installed, and the PostGIS configure script is probably picking up the wrong version. Looking above, how do I uninstall `gdal @1.8.0_0+expat`. And, what is the difference between the next two?

Only one version is active, so the wrong versions cannot actually be picked up. Perhaps you have non-macports versions also installed?

Either way, you can uninstall ambiguous port names by using the whole line that's printed from port installed:
port uninstall gdal @1.8.0_1+expat

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