# added --prefix to the default_install_python otherwise it doesn't run
python setup.py install --prefix="/usr" --staging-root "${INSTALL_ROOT}/usr" "$@" &&

# python install skips it, but calibre needs it...
if [[ ! -e "${INSTALL_ROOT}/usr/bin/python2" ]]; then
  ln -s "${INSTALL_ROOT}/usr/bin/python" "${INSTALL_ROOT}/usr/bin/python2"
fi

.