There is a problem with your systems configuration, R is not being able to find the gfortran package, how did you install R? did you install r-base-dev?
I don't know the equivalent commands for suse but you could try purging the gfortran package and reinstalling, this would be the command for debian/ubuntu dpkg --purge gfortran; apt-get install gfortran. Also verify if your versions of g++, gcc and gfortran match
Note: Just in case, all this has to be done in the system terminal not in R console.