message: nix: do not re-install the python client in the shell hook
  emacs runs the shell hook every time we focus on a buffer belonging to
  the project, so we need to keep it fast
diff: @@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
  virtualenv $VENV
  fi
  source ./$VENV/bin/activate
  - pip install -U -e './python/[dev]'
  + # pip install -U -e './python/[dev]'
  export PYTHONPATH=`pwd`/$VENV/${python.sitePackages}/:$PYTHONPATH
  export LD_LIBRARY_PATH=${lib.makeLibraryPath [ stdenv.cc.cc ]}
  