LINES and COLUMNS variables are not exported

[Thierry EXCOFFIER]

Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i486' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2
uname output: Linux pundit 2.6.15-1-686 #2 Thu Feb 2 18:29:01 UTC 2006 i686 
GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 3.1
Patch Level: 5
Release Status: release

Description:
        LINES and COLUMNS variables are not exported,
        so applications using these variables can not
        find the screen size.

Repeat-By:
        $ ( echo $LINES )
        24
        $ sh -c 'echo $LINES'

        $