* etc/guix-install.sh (chk_require): Because of the set -e option, Bash was
exiting when the command `command -v "$c" &>/dev/null' was running on its
own. Instead, we now test the command and accumulate warning messages in a
single statement by chaining the command with a logical OR.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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