bug#40093: 27.0.60; Wrong entry page for exported html Elisp manual

[Eli Zaretskii]

> From: Yuan Fu <ykf5041@psu.edu>
> Date: Mon, 16 Mar 2020 13:22:50 -0400
> 
> If I go to
>       doc/lispref
> And run
>       make -e HTML_OPTS=--html elisp.html
> To generate the HTML manual, the index page is wrong. According to the 
> makeinfo manual the index.html should be the table of contents page. But the 
> exported index.html is the index.
> 
> The index page for doc/emacs is fine. I guess that’s because Emacs manual has 
> variable index / function index (instead of a single index) so the entry page 
> index.html is not overwritten by the index page (which has the same file 
> name).

Is the filesystem on which you run this case-insensitive?