Unfortunately, you seem to have quite a few leftovers from previous compilations under different env. variables' settings.
If you still find one more, it might be better to restart from scratch
Please try the following
rm /Users/owengray/nwchem-6.6//lib/MACX64/libnwpwlib.a
cd $NWCHEM_TOP/src/nwpw
make
cd ..
make link