The error appears to be coming from the GEOMAP task used in the WREGISTER script, but there are no known issues with the task at the moment and if your Fedora 16 system is 32-bit then this may point to a 64-bit platform problem (macintel).
Could you upload your parameters and data file to the anonftp at ftp://iraf.noao.edu/pub so we can try to reproduce the problem?
I wasn't able to reproduce the problem with the most recent development version of IRAF v2.16, but could confirm it in the SciSoft release (March2012) and that it is also fixed in the most recent May2012 update to the system. To fix it on your machine, all you should need to do is
% cd /usr/local/scisoft/packages/iraf/iraf/
% make latest
This should update your IRAF scisoft installation with the May2012 release and fix the problem. If not, let me know.
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