-pip install --user --quiet --upgrade pip==18.0 setuptools==40.0.0
-pip install --user --quiet --upgrade -r "$REQUIREMENTS_FILE"
-pip freeze
+ # Use `python -m pip` to ensure we are using pip from user venv
+ python3 -m venv ~/.local
+ python3 -m pip install --user --quiet --upgrade pip
+ python3 -m pip install --user --quiet --upgrade setuptools
+ python3 -m pip install --user --quiet --upgrade --upgrade-strategy eager -r "$requirements_file"
+ rm -rf "$requirements_file"
+ touch /tmp/pre-build-complete
+fi