* Installing *source* package 'rgdal' ...
gdal-config: gdal-config
./configure: line 1: gdal-config: command not found

The gdal-config script distributed with GDAL could not be found.
If you have not installed the GDAL libraries, you can
download the source from  http://www.gdal.org/
If you have installed the GDAL libraries, then make sure that
gdal-config is in your path. Try typing gdal-config at a
shell prompt and see if it runs. If not, use:
 --configure-args='--with-gdal-config=/usr/local/bin/gdal-config' echo with appropriate values for your installation.

ERROR: configuration failed for package 'rgdal'
** Removing '/Builds/Rdev-web/QA/Simon/packages/tiger-universal/results/2.7/rgdal.Rcheck/rgdal'