Denis
Something goes wrong in the makefile structure since the Fortran compiler option that would fix your problem is missing (-fdefault-integer-8 option).
Could you please try the following:
First try:
cd $NWCHEM_TOP/src/inp
touch inp.F
make FC=gfortran
If this fails, please try this second alternative set of commands
cd $NWCHEM_TOP/src/inp
touch inp.F
make _FC=gfortran