Compilation error in CRAY XE6 with nwchem version 6.3
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Just Got Here
12:59:30 PM PST - Fri, Nov 14th 2014
It looks like you need the Cray wrappers for the C compiler
I see that you are defining FC, but not CC. Try
export FC=ftn
export CC=cc
or
make FC=ftn CC=cc >& make.log
That will add all the machinery for including and linking the MPI libraries.
Ed