shivani
Okay, probably because you don't have gsed. Can you edit the two lines in the installs script that start with sed from, for example,
sed -i'' 's|#!/usr/bin/env python|#!/usr/bin/env python3|g' ${PETSC_DIR}/config/configure.py
to,
sed -i'' -e 's|#!/usr/bin/env python|#!/usr/bin/env python3|g' ${PETSC_DIR}/config/configure.py
