Background: http://lists.freebsd.org/pipermail/freebsd-ports/2015-August/100097.html Workaround: Keep ports tree at r393816, build linux-c6-qt47-x11, linux-c6-qt47-webkit, skype4.
We'll have that issue solved once CentOS 6.7 lands - for now you could just grab the patch from https://reviews.freebsd.org/D3428
It seems like this bug report can be closed since CentOS 6.7 has landed.
Close per request. Thank you for reminding on this one.