make latex: process_overview.rst: Unusable Reference Targets

[7enderhead]

make latex
[...]
processing antiweb.tex... index installation getting_started process_overview antiweb antisphinx changelog motivation
resolving references...
writing... C:\tmp\antiweb\documentation\source\process_overview.rst:: WARNING: unusable reference target found: antiweb#how-to-add-new-languages
C:\tmp\antiweb\documentation\source\process_overview.rst:: WARNING: unusable reference target found: installation#install-graphviz-optional

[GhostPHX]

Those errors occur when there are local links between the documents, latex can't handle these links. When creating documentation in latex, one would have to remove all local links

[7enderhead]

Have you considered this: http://www.sphinx-doc.org/en/stable/markup/inline.html#ref-role