
'make htmldocs' requires graphviz and imagemagick (at least with Sphinx 3.5.4). Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
'make htmldocs' requires graphviz and imagemagick (at least with Sphinx 3.5.4). Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>