NWChem 6.6 and OS X El Capitan
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Forum Vet
11:42:44 AM PST - Wed, Jan 13th 2016
I have never used gcc/gfortran 6.0, therefore I am not quite sure your build is going to work.
Anyhow, please try the following
unset MPI_INCLUDE
unset MPI_LIB
unset LIBMPI
export PATH=/opt/local/bin/:$PATH
unset FC
unset CC
cd $NWCHEM_TOP/src/tools
make