docs: allow outside of Makefile variable assignment
This allow packagers to select the sphinx-build command version (python2 or python3) without changing the Makefile: $ SPHINXBUILD=sphinx-build2 SPHINXOPTS=... make man
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# Makefile for Sphinx documentation
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SPHINXOPTS =
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SPHINXBUILD = sphinx-build
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PAPER =
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BUILDDIR = _build
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SPHINXOPTS ?=
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SPHINXBUILD ?= sphinx-build
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PAPER ?=
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BUILDDIR ?= _build
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# Internal variables
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PAPEROPT_a4 = -D latex_paper_size=a4
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