NWChem 6.6: MA fatal error: MA sizeof: invalid datatype (macOS)


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missing -fdefault-integer-8 option
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

Notice the underscore "_" sign before FC