environment: Add --system.

* guix/scripts/environment.scm (show-help, %options): Add -s/--system.
  (%default-options): Add 'system' pair.
  (guix-environment): Pass 'system' value from OPTS to 'lower-inputs'.
* doc/guix.texi (Invoking guix environment): Document it.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index ccccf7b347..71167dfdc7 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -4219,6 +4219,10 @@ only contain package inputs.
 @item --search-paths
 Display the environment variable definitions that make up the
 environment.
+
+@item --system=@var{system}
+@itemx -s @var{system}
+Attempt to build for @var{system}---e.g., @code{i686-linux}.
 @end table
 
 It also supports all of the common build options that @command{guix