結構はまった。 blockdiag で図を PDF として生成して読み込ませるように conf.py を設定 extensions = [ 'sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.todo', ] extensions += ['sphinxcontrib.blockdiag'] blockdiag_fontpath = [ '/Library/Fonts/Microsoft/MS PGothic.ttf' ] blockdiag_html_image_format = 'PNG' blockdiag_tex_image_format = 'PDF' extensions += ['sphinxcontrib.seqdiag'] seqdiag_fontpath = ['/Library/Fonts/Microsoft