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doc: Document (list package output) syntax in operanting-system-packages.

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* doc/guix.texi (Globally-Visible Packages): Document (PACKAGE OUTPUT) syntax.
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Julien Lepiller 2017-05-01 15:44:31 +02:00
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@ -7761,7 +7761,19 @@ provides all the tools one would expect for basic user and administrator
tasks---including the GNU Core Utilities, the GNU Networking Utilities,
the GNU Zile lightweight text editor, @command{find}, @command{grep},
etc. The example above adds tcpdump to those, taken from the @code{(gnu
packages admin)} module (@pxref{Package Modules}).
packages admin)} module (@pxref{Package Modules}). The
@code{(list package output)} syntax can be used to add a specific output
of a package:
@lisp
(use-modules (gnu packages))
(use-modules (gnu packages dns))
(operating-system
;; ...
(packages (cons (list bind "utils")
%base-packages)))
@end lisp
@findex specification->package
Referring to packages by variable name, like @var{tcpdump} above, has