[CentOS] Messages during update 'yum update' at CentOS 6 VM

Mon Jul 17 10:45:25 UTC 2017
Walter H. <walter.h at mathemainzel.info>

Hello,

at the last update (Kernel updated
from 2.6.32-696.3.2.el6.x86_64 to 2.6.32-696.6.3.el6.x86_64)
I got these messages

 Updating : ipv6calc-1.0.0-20.el6.x86_64 6/25
/var/tmp/rpm-tmp.yi7R81: line 1: /usr/sbin/ldconfig: No such file or
directory
warning: %post(ipv6calc-1.0.0-20.el6.x86_64) scriptlet failed, exit status
127
Non-fatal POSTIN scriptlet failure in rpm package
ipv6calc-1.0.0-20.el6.x86_64

 Cleanup : ipv6calc-0.99.2-17.el6.x86_64 25/25
/var/tmp/rpm-tmp.i7G3si: line 1: /usr/sbin/ldconfig: No such file or
directory
warning: %postun(ipv6calc-0.99.2-17.el6.x86_64) scriptlet failed, exit
status 127
Non-fatal POSTUN scriptlet failure in rpm package ipv6calc

after this a
ipv6calc -A conv6to4 77.88.99.111
works ...

what does the messages should say to me ...

Walter