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doc: Reorder and clarify contributing instructions. 

* doc/contributing.texi (Building from Git, Running Guix Before It Is
Installed): Make instructions using Guix come first and clarify which code is
an instruction and which is merely an example.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Florian Pelz 2019-07-13 08:29:26 +02:00 committed by Ludovic Courtès
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@ -38,19 +38,6 @@ version from the Git repository:
git clone https://git.savannah.gnu.org/git/guix.git
@end example
When building Guix from a checkout,
the following packages are required in addition to those mentioned in
the installation instructions (@pxref{Requirements}).
@itemize
@item @url{http://gnu.org/software/autoconf/, GNU Autoconf};
@item @url{http://gnu.org/software/automake/, GNU Automake};
@item @url{http://gnu.org/software/gettext/, GNU Gettext};
@item @url{http://gnu.org/software/texinfo/, GNU Texinfo};
@item @url{http://www.graphviz.org/, Graphviz};
@item @url{http://www.gnu.org/software/help2man/, GNU Help2man (optional)}.
@end itemize
The easiest way to set up a development environment for Guix is, of
course, by using Guix! The following command starts a new shell where
all the dependencies and appropriate environment variables are set up to
@ -61,7 +48,22 @@ guix environment guix --pure
@end example
@xref{Invoking guix environment}, for more information on that command.
Extra dependencies can be added with @option{--ad-hoc}:
If you are unable to use Guix when building Guix from a checkout, the
following are the required packages in addition to those mentioned in the
installation instructions (@pxref{Requirements}).
@itemize
@item @url{http://gnu.org/software/autoconf/, GNU Autoconf};
@item @url{http://gnu.org/software/automake/, GNU Automake};
@item @url{http://gnu.org/software/gettext/, GNU Gettext};
@item @url{http://gnu.org/software/texinfo/, GNU Texinfo};
@item @url{http://www.graphviz.org/, Graphviz};
@item @url{http://www.gnu.org/software/help2man/, GNU Help2man (optional)}.
@end itemize
On Guix, extra dependencies can be added by instead running @command{guix
environment} with @option{--ad-hoc}:
@example
guix environment guix --pure --ad-hoc help2man git strace
@ -113,8 +115,8 @@ run @code{make install}. To do that, you first need to have an environment
with all the dependencies available (@pxref{Building from Git}), and then
simply prefix each command with
@command{./pre-inst-env} (the @file{pre-inst-env} script lives in the
top build tree of Guix; it is generated by @command{./configure}),
as in@footnote{The @option{-E} flag to
top build tree of Guix; it is generated by @command{./configure}).
An example@footnote{The @option{-E} flag to
@command{sudo} guarantees that @code{GUILE_LOAD_PATH} is correctly set
such that @command{guix-daemon} and the tools it uses can find the Guile
modules they need.}:
@ -125,7 +127,7 @@ $ ./pre-inst-env guix build hello
@end example
@noindent
Similarly, for a Guile session using the Guix modules:
Similarly, an example for a Guile session using the Guix modules:
@example
$ ./pre-inst-env guile -c '(use-modules (guix utils)) (pk (%current-system))'