Cycling first N heading levels in outline

[Christopher Dimech]

I am using GNU Emacs 27.1 and that functionality is not present.  Have tried to 
install
the development version and am getting

checking for libXaw... configure: error: No X toolkit could be found.

> Sent: Monday, May 24, 2021 at 10:57 PM
> From: "Kévin Le Gouguec" <kevin.legouguec@gmail.com>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: "Stefan Monnier" <monnier@iro.umontreal.ca>, "Ihor Radchenko" 
> <yantar92@gmail.com>, "Jean Louis" <bugs@gnu.support>, emacs-devel@gnu.org
> Subject: Re: Cycling first N heading levels in outline
>
> Christopher Dimech <dimech@gmx.com> writes:
> 
> >> The convention used in ELisp is:
> >>
> >>    ;;; Section
> >>    ;;;; Subsection
> >>    ;;;;; Subsubsection
> >>    ;;;;;; Subsubsubsection
> >>    ;;;;;;; Subsubsubsubsection
> >>    [...]
> >
> > The headings still look like comments, whereas they are supposed to get 
> > highlighted
> > according to the heading level.
> >
> > Could we get that to work in said way?
> 
> On Emacs master, the outline-minor-mode-highlight option allows you to
> customize how headings are fontified:
> 
> > When t, it puts outline faces only if there are no major mode’s faces
> > on headings.  When ‘override’, it completely overwrites major mode’s
> > faces with outline faces.  When ‘append’, it tries to append outline
> > faces to major mode’s faces.
>