Official Candidate Release of NWCHEM6.8 cannot be compiled on MAC


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Forum Vet
Dear all
  The compilation of the candidate of NWCHEM6.8 on macOS Sierra 10.12.6 with gfortran6.3.0, 
mpich 3.2_2 and Xcode 9.1 installed fails because of the following error
...
ld: library not found for -lSystem
collect2: error: ld returned 1 exit status
make: *** [all] Error 1

Very Best Regards!