+
+@defvr {Scheme Variable} copy-build-system
+@cindex (copy build system)
+This variable is exported by @code{(guix build-system copy)}. It
+supports builds of simple packages that don't require much compiling,
+mostly just moving files around.
+
+It adds much of the @code{gnu-build-system} packages to the set of
+inputs. Because of this, the @code{copy-build-system} does not require
+all the boilerplate code often needed for the
+@code{trivial-build-system}.
+
+To further simplify the file installation process, an
+@code{#:install-plan} argument is exposed to let the packager specify
+which files go where. The install plan is a list of @code{(@var{source}
+@var{target} [@var{filters}])}. @var{filters} are optional.
+
+@itemize
+@item When @var{source} matches a file or directory without trailing slash, install it to @var{target}.
+@itemize
+@item If @var{target} has a trailing slash, install @var{source} basename beneath @var{target}.
+@item Otherwise install @var{source} as @var{target}.
+@end itemize
+
+@item When @var{source} is a directory with a trailing slash, or when @var{filters} are used,
+the trailing slash of @var{target} is implied with the same meaning
+as above.
+@itemize
+@item Without @var{filters}, install the full @var{source} @emph{content} to @var{target}.
+@item With @var{filters} among @code{#:include}, @code{#:include-regexp}, @code{#:exclude},
+@code{#:exclude-regexp}, only select files are installed depending on
+the filters. Each filters is specified by a list of strings.
+@itemize
+@item With @code{#:include}, install all the files which the path suffix matches
+at least one of the elements in the given list.
+@item With @code{#:include-regexp}, install all the files which the
+subpaths match at least one of the regular expressions in the given
+list.
+@item The @code{#:exclude} and @code{#:exclude-regexp} filters
+are the complement of their inclusion counterpart. Without @code{#:include} flags,
+install all files but those matching the exclusion filters.
+If both inclusions and exclusions are specified, the exclusions are done
+on top of the inclusions.
+@end itemize
+@end itemize
+In all cases, the paths relative to @var{source} are preserved within
+@var{target}.
+@end itemize
+
+Examples:
+
+@itemize
+@item @code{("foo/bar" "share/my-app/")}: Install @file{bar} to @file{share/my-app/bar}.
+@item @code{("foo/bar" "share/my-app/baz")}: Install @file{bar} to @file{share/my-app/baz}.
+@item @code{("foo/" "share/my-app")}: Install the content of @file{foo} inside @file{share/my-app},
+e.g., install @file{foo/sub/file} to @file{share/my-app/sub/file}.
+@item @code{("foo/" "share/my-app" #:include ("sub/file"))}: Install only @file{foo/sub/file} to
+@file{share/my-app/sub/file}.
+@item @code{("foo/sub" "share/my-app" #:include ("file"))}: Install @file{foo/sub/file} to
+@file{share/my-app/file}.
+@end itemize
+@end defvr
+
+