$(PYTHON)  mistune jinja2 pygments traitlets jupyter_core nbformat entrypoints bleach pandocfilters testpath defusedxml jupyter_client jupyterlab_pygments nbclient beautifulsoup4 | $(PYTHON_TOOLCHAIN)

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All lines of this file are ignored except the first.
It is copied by SAGE_ROOT/build/make/install into SAGE_ROOT/build/make/Makefile.
