I followed the instructions for installation and compiling in the documentation heading under the title
NWChem 6.6 on Ubuntu 14.04 (Trusty Tahr)
Explicitly these are the environment variables that i set for nwchem installation
# NWChem
export NWCHEM_TOP=/home/myUserName/NWChem/nwchem-6.6
export USE_MPI=y
export NWCHEM_TARGET=LINUX64
export USE_PYTHONCONFIG=y
export PYTHONVERSION=2.7
export PYTHONHOME=/usr
export BLASOPT="-lopenblas -lpthread -lrt"
export BLAS_SIZE=4
export USE_64TO32=y
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