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@@ -73,7 +73,13 @@ rst_prolog = """
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# The theme to use for HTML and HTML Help pages. See the documentation for
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# a list of builtin themes.
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#
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-html_theme = 'sphinx_rtd_theme'
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+try:
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+ import sphinx_rtd_theme
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+ html_theme = 'sphinx_rtd_theme'
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+except ImportError:
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+ sys.stderr.write("The Sphinx sphinx_rtd_theme HTML theme was not found.\
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+ \nPlease make sure to install the sphinx_rtd_theme python package.\n")
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+ sys.exit(1)
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# Add any paths that contain custom static files (such as style sheets) here,
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# relative to this directory. They are copied after the builtin static files,
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