bug#71022: [PATCH v2] configure.ac: Set default value for the 'prefix' variable.

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi,

Ludovic Courtès <ludo@gnu.org> writes:

> Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
>
>> The Guix standard configuration uses a localstatedir of /var and a sysconfdir
>> of /etc.  To ease things for everyone, make the default values match that
>> standard expected configuration.  See
>> <https://lists.gnu.org/archive/html/guix-devel/2024-05/msg00003.html> for a
>> related discussion.
>>
>> * configure.ac: Default $prefix to '' unless already set.
>> * doc/contributing.texi (Building from Git): Streamline doc.
>> * doc/guix-cookbook.texi (Guix environment via direnv): Likewise.
>>
>> Change-Id: I23cd12b58a842d246fbc9fdc740311c573eb0212
>
> LGTM! :-)

I ran 'make distcheck', which initially failed with a

--8<---------------cut here---------------start------------->8---
'dot' error: Format: "pdf" not recognized. Use one of: canon cmap cmapx cmapx_np
dot dot_json eps fig gd gd2 gif gv imap imap_np ismap jpe
jpeg jpg json json0 mp pic plain plain-ext png pov ps ps2
svg svgz tk vdx vml vmlz vrml wbmp xdot xdot1.2 xdot1.4 xdot_json
--8<---------------cut here---------------end--------------->8---

error.  I needed to use the full graphviz, not 'graphviz-minimal' as
used by the Guix package.

I also had to add imagemagick for the 'convert' command.  After that it
proceeded normally; it failed finding many missing substitutes but
otherwise 'make distcheck' went fine.

Pushed, at last.  Some related commits to the above will appear to
guix-patches soon.

-- 
Maxim