For all systems installing rgdal from source, it is recommended that you
consider not installing binary external dependencies, but installing them
from source. All of the Linux GIS packages, be it Debian or RPM, have
had numerous reported problems. So far, all installation problems on such
systems have turned out to be problems in the external dependencies of
rgdal, often multiple installs of GDAL (with the library pointed to by
gdal-config not being the first such in the search path), or similar.
I previously removed the old gdal RPMs, so there should be no 'gdal'
left-overs.
With elgis' gdal-1.7.3-3_0.el5.elgis.x86_64 and rgdal version 0.6-33, things
worked fine.
So this is work for you, nobody else. Using binary packages has advantages
and disadvantages, you've hit a disadvantage, that "dependency hell" has
said "hello".
Well, installing from source may resolve one particular problem but
introduces again new dependencies. Beside providing binaries, package
managers and repositories such as 'elgis' for RHEL (and many others) are
helping a lot to resolve exactly this "dependency hell".
Thus, I guess this issue might interest others too.
Thomas