Let's try too keep it simple since you have too many variables to deal with (MKL,Scalapack, MPI, etc ...)
Please set (and unset) the following variables
export NWCHEM_TOP=~/Softwares/nwchem-6.6
export NWCHEM_TARGET=LINUX64
export NWCHEM_MODULES=all
export USE_INTERNALBLAS=y
export USE_MPI=y
export USE_MPIF=y
export USE_MPIF4=y
export PATH=/opt/software/openmpi/1.4.3-gcc/bin:$PATH
unset USE_OPENMP
unset BLASOPT
unset SCALAPACK
unset BLAS_SIZE
unset SCALAPACK_SIZE
unset MPI_LIB
unset MPI_INCLUDE
unset LIBMPI
Then, recompile from scratch
cd $NWCHEM_TOP/src
make realclean
rm -rf tools/build tools/install
rm -rf ../lib/LINUX64/*
make nwchem_config
make FC=ifort >& make_intel.log
By the way, pre-compiled NWChem 6.6 is available for RedHat 6.6 from the Epel repository. You can install it by typing the following commands
sudo yum -y install http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
sudo yum update
sudo yum install nwchem-openmpi.x86_64
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