[Suggestion] Documentation: quick-install-man not propagating DESTDIR

> diff --git a/Makefile b/Makefile
> index 372139f1f2..dae2d99a7f 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -2992,10 +2992,10 @@ install-gitweb:
>         $(MAKE) -C gitweb install
>
> install-doc: install-man-perl
> -       $(MAKE) -C Documentation install
> +       $(MAKE) -C Documentation install DESTDIR=$(DESTDIR)
>
> install-man: install-man-perl
> -       $(MAKE) -C Documentation install-man
> +       $(MAKE) -C Documentation install-man DESTDIR=$(DESTDIR)
>
> install-man-perl: man-perl
>         $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(mandir_SQ)/man3'
> @@ -3006,19 +3006,19 @@ install-html:
>         $(MAKE) -C Documentation install-html
>
> install-info:
> -       $(MAKE) -C Documentation install-info
> +       $(MAKE) -C Documentation install-info DESTDIR=$(DESTDIR)
>
> install-pdf:
> -       $(MAKE) -C Documentation install-pdf
> +       $(MAKE) -C Documentation install-pdf DESTDIR=$(DESTDIR)
>
> quick-install-doc:
> -       $(MAKE) -C Documentation quick-install
> +       $(MAKE) -C Documentation quick-install DESTDIR=$(DESTDIR)
>
> quick-install-man:
> -       $(MAKE) -C Documentation quick-install-man
> +       $(MAKE) -C Documentation quick-install-man DESTDIR=$(DESTDIR)
>
> quick-install-html:
> -       $(MAKE) -C Documentation quick-install-html
> +       $(MAKE) -C Documentation quick-install-html DESTDIR=$(DESTDIR)
>
> -- Brief whoami:
> NonStop developer since approximately 211288444200000000
> UNIX developer since approximately 421664400
> -- In my real life, I talk too much.

> "Randall S. Becker" <rsbecker@nexbridge.com> writes:
> 
> > The make quick-install-man rule is not propagating DESTDIR when GNU
> > Make
> > 4.2.1 is used.
> 
> I wonder, instead of having to change all "$(MAKE) -C elsewhere", we can
> add DESTDIR to the list of variables that are exported.
> 
> ... goes and looks ...
> 
> Hmph, DESTDIR is exported together with DIFF, TAR, INSTALL and
> SHELL_PATH.  We do rely on SHELL_PATH to be exported correctly to
> t/Makefile for "make test" to work, so it is puzzling.
> 
> It is doubly puzzling that we use $(INSTALL) in Documentation/Makefile on
> the same line as $(DESTDIR) is used, and apparently you are not reporting
> problem on that one.
> 
> > It seems like a bit of a nit to report this, but I discovered that the
> > installation is not putting the manuals in the same place as git. It’s
> > a pretty simple fix. I can put a patch together if desired.
> 
> I do not think we want that patch.  Instead I think we'd want a patch that
> uses the same trick as what makes INSTALL work.