Ctrl-L does nothing

[humpty]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux chorion 2.6.26-2-vserver-686 #1 SMP Thu Sep 16 23:09:48 UTC 
2010 i686 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.0
Patch Level: 0
Release Status: release

Description:
        From a fresh installed Debian Lenny, and a CentOS 5 in a Linux-Vserver, 
I've downloaded and compiled bash 4.0, and Ctrl-L does nothing, but going to a 
new prompt line as a single Enter 
would.
        usually Ctrl-L clear the screen.

Repeat-By:
        Ctrl-L