Installation problem on RedHat Enterprise 4

I'm trying to install OpenMx using R-2.10.1 on RedHat Enterprise 4, and I get the following error in the compile:

gcc -std=gnu99 -shared -L/usr/local/lib64 -o OpenMx.so npsolWrap.o omxAlgebra.o omxAlgebraFunctions.o omxAlgebraObjective.o omxData.o omxFIMLObjective.o omxMLObjective.o omxMatrix.o omxObjective.o omxObjectiveTable.o omxRAMObjective.o omxRObjective.o omxRowObjective.o omxState.o omxSymbolTable.o sadmvn.o -lgfortran -lm -L/afs/.isis/pkg/r-2.10.1/lib/R/lib -lRblas -L/afs/.isis/pkg/r-2.10.1/lib/R/lib -lRlapack -lnpsol -L../inst/npsol/linux/x86/gcc3.4 -lgfortran -lm -L/afs/.isis/pkg/r-2.10.1/lib/R/lib -lR
/usr/bin/ld: cannot find -lgfortran
collect2: ld returned 1 exit status
make: *** [OpenMx.so] Error 1
ERROR: compilation failed for package 'OpenMx'

I noticed the -L/usr/local/lib64 argument, I don't have this directory on this system, it's 32-bit, I suspect this is the problem. The libgfortran files are in /usr/lib.

I successfully installed this on a RedHat Enterprise 5 system which is 64-bit.

I'm using source('http://openmx.psyc.virginia.edu/getOpenMx.R') to do the install. Any assistance would be appreciated.

Thanks,
Mike