[K12OSN] Problem with ltsp-build-client

[Radek Bursztynowski]

Hello All,
        
I try to install new LTSP k12Linux but there is no positive result.
The first I installed CentOS 6.4 x86_64. Next I followed
http://wiki.ltsp.org/wiki/Category:Fedora. 

yum install ltsp-server finished with no any error.
I executed ltsp-build-client. Installation has suspended with 26% gone.
        
I repeated all with another server - the same situation.
ltsp-build-client suspends with 26% gone.
        
I checked /opt/ltsp/mock/epel-6-i386/result/root.log but I can't see
anything interesting
(https://www.bursztynowski.waw.pl/ftp/linux/LinuxTerminalServerProject/5/K12Linux/root.log).

What should I check or do to fix my problem?
        
Best regards,
Radek