case "$MODE" in
    commandline)
        add_option "arch" "`eval_gettext "set the target architecture"`" "advanced" "true"
        ;;
    configure)
        if [ -n "$option_arch_value" ]; then
            ARCH_OPT="$option_arch_value"
        elif [ -n "${ARCH}" ]; then
            ARCH_OPT=${ARCH}
        else
            ARCH_OPT=$(uname -m | sed -e s/i.86/i386/ -e s/ppc.*/powerpc/)
        fi

        # Validate the proposed architecture value.
        case "$ARCH_OPT" in
            i386)
            case "$(uname -m)" in
                x86_64|ia64|i386|i486|i586|i686)
                ARCH=i386
                ;;
                *)
                printf "`eval_gettext "ERROR: --arch %s called on unsupported arch: %s"`", i386 $(uname -m)
                exit 1
                ;;
            esac
            ;;
            powerpc)
            case "$(uname -m)" in
                ppc64|ppc)
                ARCH=powerpc
                ;;
                *)
                printf "`eval_gettext "ERROR: --arch %s called on unsupported arch: %s"`", powerpc $(uname -m)
                exit 1
                ;;
            esac
            ;;
            x86_64|amd64)
            case "$(uname -m)" in
                x86_64)
                ARCH=amd64
                ;;
                *)
                printf "`eval_gettext "ERROR: --arch %s called on unsupported arch: %s"`", amd64 $(uname -m)
                exit 1
                ;;
            esac
            ;;

            *)
            printf "`eval_gettext "ERROR: unsupported architecture. Check your --arch argument: %s"`", $ARCH_OPT
            printf "`eval_gettext "       supported values are: %s"`", "i386 x86_64 (or amd64) powerpc"
            exit 1
            ;;
        esac      
        ;;
esac