Meanwhile I copied the eink_ binaries from your image, still a no go :/
[root@kobo-touch debian]# ./debian.sh
root@kobo-touch:/# xinit xarclock
_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/kobo-touch:0
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6
X.Org X Server 1.12.4
Release Date: 2012-08-27
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-4-mv78xx0 armv5tel Debian
Current Operating System: Linux kobo-touch 2.6.35.3-850-gbc67621+ #5 PREEMPT Wed Dec 18 04:09:06 GMT 2013 armv7l
Kernel command line: console=ttymxc0,115200 rootwait rw quiet lpj=3997696 root=/dev/mmcblk0p1 rootfstype=ext4 hwcfg_p=0x7ffffe00 hwcfg_sz=110 waveform_p=0x7fe5fa00 waveform_sz=1704879 mem=254M
Build Date: 21 October 2013 06:03:54PM
xorg-server 2:1.12.4-6+deb7u1 (Moritz Muehlenhoff <jmm@debian.org>)
Current version of pixman: 0.26.0
Before reporting problems, check
http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sat Dec 21 20:11:13 2013
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"