The LaTeX code generated by Sphinx in 2.6a1 is incorrect. Some, but not 
all, of the \end{Verbatim}'s come at the ends of lines, rather than on 
lines of their own. Here is an example, at line 435 of reference.tex.

            return r                # error: inconsistent 
dedent\end{Verbatim}

Each occurrence of this construction results in the `make all-pdf'  
failing. 

Also, at approximately line 42051 of library.tex, the environment classdescni is undefined.