* Building from Git:: The latest and greatest.
* Running Guix Before It Is Installed:: Hacker tricks.
* The Perfect Setup:: The right tools.
+* Packaging Guidelines:: Growing the distribution.
* Coding Style:: Hygiene of the contributor.
* Submitting Patches:: Share your work.
@end menu
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}).
+@cindex authentication, of a Guix checkout
+How do you ensure that you obtained a genuine copy of the repository?
+Guix itself provides a tool to @dfn{authenticate} your checkout, but you
+must first make sure this tool is genuine in order to ``bootstrap'' the
+trust chain. To do that, run:
-@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
+@c XXX: Adjust instructions when there's a known tag to start from.
+@example
+git verify-commit `git log --format=%H build-aux/git-authenticate.scm`
+@end example
+
+The output must look something like:
+
+@example
+gpg: Signature made Fri 27 Dec 2019 01:27:41 PM CET
+gpg: using RSA key 3CE464558A84FDC69DB40CFB090B11993D9AEBB5
+@dots{}
+gpg: Signature made Fri 27 Dec 2019 01:25:22 PM CET
+gpg: using RSA key 3CE464558A84FDC69DB40CFB090B11993D9AEBB5
+@dots{}
+@end example
+
+@noindent
+... meaning that changes to this file are all signed with key
+@code{3CE464558A84FDC69DB40CFB090B11993D9AEBB5} (you may need to fetch
+this key from a key server, if you have not done it yet).
+
+From there on, you can authenticate all the commits included in your
+checkout by running:
+
+@example
+make authenticate
+@end example
+
+The first run takes a couple of minutes, but subsequent runs are faster.
+
+@quotation Note
+You are advised to run @command{make authenticate} after every
+@command{git pull} invocation. This ensures you keep receiving valid
+changes to the repository
+@end quotation
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
hack on Guix:
@example
-guix environment guix
+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 --ad-hoc help2man git strace
+guix environment guix --pure --ad-hoc help2man git strace
@end example
Run @command{./bootstrap} to generate the build system infrastructure
Then, run @command{./configure} as usual. Make sure to pass
@code{--localstatedir=@var{directory}} where @var{directory} is the
@code{localstatedir} value used by your current installation (@pxref{The
-Store}, for information about this).
+Store}, for information about this). We recommend to use the value
+@code{/var}.
Finally, you have to invoke @code{make check} to run tests
(@pxref{Running the Test Suite}). If anything
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), 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.}:
@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))'
for Guile hacking (@pxref{Using Guile in Emacs,,, guile, Guile Reference
Manual}). First, you need more than an editor, you need
@url{http://www.gnu.org/software/emacs, Emacs}, empowered by the
-wonderful @url{http://nongnu.org/geiser/, Geiser}.
+wonderful @url{http://nongnu.org/geiser/, Geiser}. To set that up, run:
+
+@example
+guix package -i emacs guile emacs-geiser
+@end example
Geiser allows for interactive and incremental development from within
Emacs: code compilation and evaluation from within buffers, access to
@code{...}, which also can be expanded further.
+@node Packaging Guidelines
+@section Packaging Guidelines
+
+@cindex packages, creating
+The GNU distribution is nascent and may well lack some of your favorite
+packages. This section describes how you can help make the distribution
+grow.
+
+Free software packages are usually distributed in the form of
+@dfn{source code tarballs}---typically @file{tar.gz} files that contain
+all the source files. Adding a package to the distribution means
+essentially two things: adding a @dfn{recipe} that describes how to
+build the package, including a list of other packages required to build
+it, and adding @dfn{package metadata} along with that recipe, such as a
+description and licensing information.
+
+In Guix all this information is embodied in @dfn{package definitions}.
+Package definitions provide a high-level view of the package. They are
+written using the syntax of the Scheme programming language; in fact,
+for each package we define a variable bound to the package definition,
+and export that variable from a module (@pxref{Package Modules}).
+However, in-depth Scheme knowledge is @emph{not} a prerequisite for
+creating packages. For more information on package definitions,
+@pxref{Defining Packages}.
+
+Once a package definition is in place, stored in a file in the Guix
+source tree, it can be tested using the @command{guix build} command
+(@pxref{Invoking guix build}). For example, assuming the new package is
+called @code{gnew}, you may run this command from the Guix build tree
+(@pxref{Running Guix Before It Is Installed}):
+
+@example
+./pre-inst-env guix build gnew --keep-failed
+@end example
+
+Using @code{--keep-failed} makes it easier to debug build failures since
+it provides access to the failed build tree. Another useful
+command-line option when debugging is @code{--log-file}, to access the
+build log.
+
+If the package is unknown to the @command{guix} command, it may be that
+the source file contains a syntax error, or lacks a @code{define-public}
+clause to export the package variable. To figure it out, you may load
+the module from Guile to get more information about the actual error:
+
+@example
+./pre-inst-env guile -c '(use-modules (gnu packages gnew))'
+@end example
+
+Once your package builds correctly, please send us a patch
+(@pxref{Submitting Patches}). Well, if you need help, we will be happy to
+help you too. Once the patch is committed in the Guix repository, the
+new package automatically gets built on the supported platforms by
+@url{@value{SUBSTITUTE-SERVER}, our continuous integration system}.
+
+@cindex substituter
+Users can obtain the new package definition simply by running
+@command{guix pull} (@pxref{Invoking guix pull}). When
+@code{@value{SUBSTITUTE-SERVER}} is done building the package, installing the
+package automatically downloads binaries from there
+(@pxref{Substitutes}). The only place where human intervention is
+needed is to review and apply the patch.
+
+
+@menu
+* Software Freedom:: What may go into the distribution.
+* Package Naming:: What's in a name?
+* Version Numbers:: When the name is not enough.
+* Synopses and Descriptions:: Helping users find the right package.
+* Python Modules:: A touch of British comedy.
+* Perl Modules:: Little pearls.
+* Java Packages:: Coffee break.
+* Fonts:: Fond of fonts.
+@end menu
+
+@node Software Freedom
+@subsection Software Freedom
+
+@c Adapted from http://www.gnu.org/philosophy/philosophy.html.
+@cindex free software
+The GNU operating system has been developed so that users can have
+freedom in their computing. GNU is @dfn{free software}, meaning that
+users have the @url{http://www.gnu.org/philosophy/free-sw.html,four
+essential freedoms}: to run the program, to study and change the program
+in source code form, to redistribute exact copies, and to distribute
+modified versions. Packages found in the GNU distribution provide only
+software that conveys these four freedoms.
+
+In addition, the GNU distribution follow the
+@url{http://www.gnu.org/distros/free-system-distribution-guidelines.html,free
+software distribution guidelines}. Among other things, these guidelines
+reject non-free firmware, recommendations of non-free software, and
+discuss ways to deal with trademarks and patents.
+
+Some otherwise free upstream package sources contain a small and optional
+subset that violates the above guidelines, for instance because this subset
+is itself non-free code. When that happens, the offending items are removed
+with appropriate patches or code snippets in the @code{origin} form of the
+package (@pxref{Defining Packages}). This way, @code{guix
+build --source} returns the ``freed'' source rather than the unmodified
+upstream source.
+
+
+@node Package Naming
+@subsection Package Naming
+
+@cindex package name
+A package has actually two names associated with it:
+First, there is the name of the @emph{Scheme variable}, the one following
+@code{define-public}. By this name, the package can be made known in the
+Scheme code, for instance as input to another package. Second, there is
+the string in the @code{name} field of a package definition. This name
+is used by package management commands such as
+@command{guix package} and @command{guix build}.
+
+Both are usually the same and correspond to the lowercase conversion of
+the project name chosen upstream, with underscores replaced with
+hyphens. For instance, GNUnet is available as @code{gnunet}, and
+SDL_net as @code{sdl-net}.
+
+We do not add @code{lib} prefixes for library packages, unless these are
+already part of the official project name. But @pxref{Python
+Modules} and @ref{Perl Modules} for special rules concerning modules for
+the Python and Perl languages.
+
+Font package names are handled differently, @pxref{Fonts}.
+
+
+@node Version Numbers
+@subsection Version Numbers
+
+@cindex package version
+We usually package only the latest version of a given free software
+project. But sometimes, for instance for incompatible library versions,
+two (or more) versions of the same package are needed. These require
+different Scheme variable names. We use the name as defined
+in @ref{Package Naming}
+for the most recent version; previous versions use the same name, suffixed
+by @code{-} and the smallest prefix of the version number that may
+distinguish the two versions.
+
+The name inside the package definition is the same for all versions of a
+package and does not contain any version number.
+
+For instance, the versions 2.24.20 and 3.9.12 of GTK+ may be packaged as follows:
+
+@lisp
+(define-public gtk+
+ (package
+ (name "gtk+")
+ (version "3.9.12")
+ ...))
+(define-public gtk+-2
+ (package
+ (name "gtk+")
+ (version "2.24.20")
+ ...))
+@end lisp
+If we also wanted GTK+ 3.8.2, this would be packaged as
+@lisp
+(define-public gtk+-3.8
+ (package
+ (name "gtk+")
+ (version "3.8.2")
+ ...))
+@end lisp
+
+@c See <https://lists.gnu.org/archive/html/guix-devel/2016-01/msg00425.html>,
+@c for a discussion of what follows.
+@cindex version number, for VCS snapshots
+Occasionally, we package snapshots of upstream's version control system
+(VCS) instead of formal releases. This should remain exceptional,
+because it is up to upstream developers to clarify what the stable
+release is. Yet, it is sometimes necessary. So, what should we put in
+the @code{version} field?
+
+Clearly, we need to make the commit identifier of the VCS snapshot
+visible in the version string, but we also need to make sure that the
+version string is monotonically increasing so that @command{guix package
+--upgrade} can determine which version is newer. Since commit
+identifiers, notably with Git, are not monotonically increasing, we add
+a revision number that we increase each time we upgrade to a newer
+snapshot. The resulting version string looks like this:
+
+@example
+2.0.11-3.cabba9e
+ ^ ^ ^
+ | | `-- upstream commit ID
+ | |
+ | `--- Guix package revision
+ |
+latest upstream version
+@end example
+
+It is a good idea to strip commit identifiers in the @code{version}
+field to, say, 7 digits. It avoids an aesthetic annoyance (assuming
+aesthetics have a role to play here) as well as problems related to OS
+limits such as the maximum shebang length (127 bytes for the Linux
+kernel.) It is best to use the full commit identifiers in
+@code{origin}s, though, to avoid ambiguities. A typical package
+definition may look like this:
+
+@lisp
+(define my-package
+ (let ((commit "c3f29bc928d5900971f65965feaae59e1272a3f7")
+ (revision "1")) ;Guix package revision
+ (package
+ (version (git-version "0.9" revision commit))
+ (source (origin
+ (method git-fetch)
+ (uri (git-reference
+ (url "git://example.org/my-package.git")
+ (commit commit)))
+ (sha256 (base32 "1mbikn@dots{}"))
+ (file-name (git-file-name name version))))
+ ;; @dots{}
+ )))
+@end lisp
+
+@node Synopses and Descriptions
+@subsection Synopses and Descriptions
+
+@cindex package description
+@cindex package synopsis
+As we have seen before, each package in GNU@tie{}Guix includes a
+synopsis and a description (@pxref{Defining Packages}). Synopses and
+descriptions are important: They are what @command{guix package
+--search} searches, and a crucial piece of information to help users
+determine whether a given package suits their needs. Consequently,
+packagers should pay attention to what goes into them.
+
+Synopses must start with a capital letter and must not end with a
+period. They must not start with ``a'' or ``the'', which usually does
+not bring anything; for instance, prefer ``File-frobbing tool'' over ``A
+tool that frobs files''. The synopsis should say what the package
+is---e.g., ``Core GNU utilities (file, text, shell)''---or what it is
+used for---e.g., the synopsis for GNU@tie{}grep is ``Print lines
+matching a pattern''.
+
+Keep in mind that the synopsis must be meaningful for a very wide
+audience. For example, ``Manipulate alignments in the SAM format''
+might make sense for a seasoned bioinformatics researcher, but might be
+fairly unhelpful or even misleading to a non-specialized audience. It
+is a good idea to come up with a synopsis that gives an idea of the
+application domain of the package. In this example, this might give
+something like ``Manipulate nucleotide sequence alignments'', which
+hopefully gives the user a better idea of whether this is what they are
+looking for.
+
+Descriptions should take between five and ten lines. Use full
+sentences, and avoid using acronyms without first introducing them.
+Please avoid marketing phrases such as ``world-leading'',
+``industrial-strength'', and ``next-generation'', and avoid superlatives
+like ``the most advanced''---they are not helpful to users looking for a
+package and may even sound suspicious. Instead, try to be factual,
+mentioning use cases and features.
+
+@cindex Texinfo markup, in package descriptions
+Descriptions can include Texinfo markup, which is useful to introduce
+ornaments such as @code{@@code} or @code{@@dfn}, bullet lists, or
+hyperlinks (@pxref{Overview,,, texinfo, GNU Texinfo}). However you
+should be careful when using some characters for example @samp{@@} and
+curly braces which are the basic special characters in Texinfo
+(@pxref{Special Characters,,, texinfo, GNU Texinfo}). User interfaces
+such as @command{guix package --show} take care of rendering it
+appropriately.
+
+Synopses and descriptions are translated by volunteers
+@uref{http://translationproject.org/domain/guix-packages.html, at the
+Translation Project} so that as many users as possible can read them in
+their native language. User interfaces search them and display them in
+the language specified by the current locale.
+
+To allow @command{xgettext} to extract them as translatable strings,
+synopses and descriptions @emph{must be literal strings}. This means
+that you cannot use @code{string-append} or @code{format} to construct
+these strings:
+
+@lisp
+(package
+ ;; @dots{}
+ (synopsis "This is translatable")
+ (description (string-append "This is " "*not*" " translatable.")))
+@end lisp
+
+Translation is a lot of work so, as a packager, please pay even more
+attention to your synopses and descriptions as every change may entail
+additional work for translators. In order to help them, it is possible
+to make recommendations or instructions visible to them by inserting
+special comments like this (@pxref{xgettext Invocation,,, gettext, GNU
+Gettext}):
+
+@example
+;; TRANSLATORS: "X11 resize-and-rotate" should not be translated.
+(description "ARandR is designed to provide a simple visual front end
+for the X11 resize-and-rotate (RandR) extension. @dots{}")
+@end example
+
+
+@node Python Modules
+@subsection Python Modules
+
+@cindex python
+We currently package Python 2 and Python 3, under the Scheme variable names
+@code{python-2} and @code{python} as explained in @ref{Version Numbers}.
+To avoid confusion and naming clashes with other programming languages, it
+seems desirable that the name of a package for a Python module contains
+the word @code{python}.
+
+Some modules are compatible with only one version of Python, others with both.
+If the package Foo compiles only with Python 3, we name it
+@code{python-foo}; if it compiles only with Python 2, we name it
+@code{python2-foo}. If it is compatible with both versions, we create two
+packages with the corresponding names.
+
+If a project already contains the word @code{python}, we drop this;
+for instance, the module python-dateutil is packaged under the names
+@code{python-dateutil} and @code{python2-dateutil}. If the project name
+starts with @code{py} (e.g.@: @code{pytz}), we keep it and prefix it as
+described above.
+
+@subsubsection Specifying Dependencies
+@cindex inputs, for Python packages
+
+Dependency information for Python packages is usually available in the
+package source tree, with varying degrees of accuracy: in the
+@file{setup.py} file, in @file{requirements.txt}, or in @file{tox.ini}.
+
+Your mission, when writing a recipe for a Python package, is to map
+these dependencies to the appropriate type of ``input'' (@pxref{package
+Reference, inputs}). Although the @code{pypi} importer normally does a
+good job (@pxref{Invoking guix import}), you may want to check the
+following check list to determine which dependency goes where.
+
+@itemize
+
+@item
+We currently package Python 2 with @code{setuptools} and @code{pip}
+installed like Python 3.4 has per default. Thus you don't need to
+specify either of these as an input. @command{guix lint} will warn you
+if you do.
+
+@item
+Python dependencies required at run time go into
+@code{propagated-inputs}. They are typically defined with the
+@code{install_requires} keyword in @file{setup.py}, or in the
+@file{requirements.txt} file.
+
+@item
+Python packages required only at build time---e.g., those listed with
+the @code{setup_requires} keyword in @file{setup.py}---or only for
+testing---e.g., those in @code{tests_require}---go into
+@code{native-inputs}. The rationale is that (1) they do not need to be
+propagated because they are not needed at run time, and (2) in a
+cross-compilation context, it's the ``native'' input that we'd want.
+
+Examples are the @code{pytest}, @code{mock}, and @code{nose} test
+frameworks. Of course if any of these packages is also required at
+run-time, it needs to go to @code{propagated-inputs}.
+
+@item
+Anything that does not fall in the previous categories goes to
+@code{inputs}, for example programs or C libraries required for building
+Python packages containing C extensions.
+
+@item
+If a Python package has optional dependencies (@code{extras_require}),
+it is up to you to decide whether to add them or not, based on their
+usefulness/overhead ratio (@pxref{Submitting Patches, @command{guix
+size}}).
+
+@end itemize
+
+
+@node Perl Modules
+@subsection Perl Modules
+
+@cindex perl
+Perl programs standing for themselves are named as any other package,
+using the lowercase upstream name.
+For Perl packages containing a single class, we use the lowercase class name,
+replace all occurrences of @code{::} by dashes and prepend the prefix
+@code{perl-}.
+So the class @code{XML::Parser} becomes @code{perl-xml-parser}.
+Modules containing several classes keep their lowercase upstream name and
+are also prepended by @code{perl-}. Such modules tend to have the word
+@code{perl} somewhere in their name, which gets dropped in favor of the
+prefix. For instance, @code{libwww-perl} becomes @code{perl-libwww}.
+
+
+@node Java Packages
+@subsection Java Packages
+
+@cindex java
+Java programs standing for themselves are named as any other package,
+using the lowercase upstream name.
+
+To avoid confusion and naming clashes with other programming languages,
+it is desirable that the name of a package for a Java package is
+prefixed with @code{java-}. If a project already contains the word
+@code{java}, we drop this; for instance, the package @code{ngsjava} is
+packaged under the name @code{java-ngs}.
+
+For Java packages containing a single class or a small class hierarchy,
+we use the lowercase class name, replace all occurrences of @code{.} by
+dashes and prepend the prefix @code{java-}. So the class
+@code{apache.commons.cli} becomes package
+@code{java-apache-commons-cli}.
+
+
+@node Fonts
+@subsection Fonts
+
+@cindex fonts
+For fonts that are in general not installed by a user for typesetting
+purposes, or that are distributed as part of a larger software package,
+we rely on the general packaging rules for software; for instance, this
+applies to the fonts delivered as part of the X.Org system or fonts that
+are part of TeX Live.
+
+To make it easier for a user to search for fonts, names for other packages
+containing only fonts are constructed as follows, independently of the
+upstream package name.
+
+The name of a package containing only one font family starts with
+@code{font-}; it is followed by the foundry name and a dash @code{-}
+if the foundry is known, and the font family name, in which spaces are
+replaced by dashes (and as usual, all upper case letters are transformed
+to lower case).
+For example, the Gentium font family by SIL is packaged under the name
+@code{font-sil-gentium}.
+
+For a package containing several font families, the name of the collection
+is used in the place of the font family name.
+For instance, the Liberation fonts consist of three families,
+Liberation Sans, Liberation Serif and Liberation Mono.
+These could be packaged separately under the names
+@code{font-liberation-sans} and so on; but as they are distributed together
+under a common name, we prefer to package them together as
+@code{font-liberation}.
+
+In the case where several formats of the same font family or font collection
+are packaged separately, a short form of the format, prepended by a dash,
+is added to the package name. We use @code{-ttf} for TrueType fonts,
+@code{-otf} for OpenType fonts and @code{-type1} for PostScript Type 1
+fonts.
+
+
@node Coding Style
@section Coding Style
Make sure the package builds on your platform, using @code{guix build
@var{package}}.
+@item
+We recommend you also try building the package on other supported
+platforms. As you may not have access to actual hardware platforms, we
+recommend using the @code{qemu-binfmt-service-type} to emulate them. In
+order to enable it, add the following service to the list of services in
+your @code{operating-system} configuration:
+
+@lisp
+(service qemu-binfmt-service-type
+ (qemu-binfmt-configuration
+ (platforms (lookup-qemu-platforms "arm" "aarch64" "mips64el"))
+ (guix-support? #t)))
+@end lisp
+
+Then reconfigure your system.
+
+You can then build packages for different platforms by specifying the
+@code{--system} option. For example, to build the "hello" package for
+the armhf, aarch64, or mips64 architectures, you would run the following
+commands, respectively:
+@example
+guix build --system=armhf-linux --rounds=2 hello
+guix build --system=aarch64-linux --rounds=2 hello
+guix build --system=mips64el-linux --rounds=2 hello
+@end example
+
@item
@cindex bundling
Make sure the package does not use bundled copies of software already
(@pxref{Invoking guix size}). This will allow you to notice references
to other packages unwillingly retained. It may also help determine
whether to split the package (@pxref{Packages with Multiple Outputs}),
-and which optional dependencies should be used.
+and which optional dependencies should be used. In particular, avoid adding
+@code{texlive} as a dependency: because of its extreme size, use
+@code{texlive-tiny} or @code{texlive-union} instead.
@item
For important changes, check that dependent package (if applicable) are
2.5 months or so.
@end table
-All these branches are @uref{https://hydra.gnu.org/project/gnu,
+All these branches are @uref{@value{SUBSTITUTE-SERVER},
tracked by our build farm} and merged into @code{master} once
everything has been successfully built. This allows us to fix issues
before they hit users, and to reduce the window during which pre-built
Another option is to use @command{guix challenge} (@pxref{Invoking guix
challenge}). You may run it once the package has been committed and
-built by @code{hydra.gnu.org} to check whether it obtains the same
+built by @code{@value{SUBSTITUTE-SERVER}} to check whether it obtains the same
result as you did. Better yet: Find another machine that can build it
and run @command{guix publish}. Since the remote build machine is
likely different from yours, this can catch non-determinism issues
the URL: it is not very useful and if the name changes, the URL will probably
be wrong.
+@item
+Check if Guix builds (@pxref{Building from Git}) and address the
+warnings, especially those about use of undefined symbols.
+
+@item
+Make sure your changes do not break Guix and simulate a @code{guix pull} with:
+@example
+guix pull --url=/path/to/your/checkout --profile=/tmp/guix.master
+@end example
+
@end enumerate
When posting a patch to the mailing list, use @samp{[PATCH] @dots{}} as
subsequent patches to @email{@var{NNN}@@debbugs.gnu.org} to make sure
they are kept together. See
@uref{https://debbugs.gnu.org/Advanced.html, the Debbugs documentation}
-for more information.
+for more information. You can install @command{git send-email} with
+@command{guix install git:send-email}.
@c Debbugs bug: https://debbugs.gnu.org/db/15/15361.html
HCoop / jackhill / guix / guix.git / blobdiff