My build machine is inaccessible from here and I may take some time to reply. In the mean-time I can reply to some posts.
I am running Slackware-x86_64 14.2 (stable) on all
my machines - a build server, a PC and a laptop, not
current. I am getting the same error message on my machines.
I'd say that your post proved exactly the opposite.
There is a good reason that I compile my VLC package with a lot of statically compiled libraries. It means, there's no interference from OS changes that kan kill my most-used program.
Managing and updating 3rd party packages is very time consuming, but I admit that it is challenging and fun. I like the SBo set up and since I started using their builds, (probably around 2008), I hardly had any issues. I use SBo builds extensively. Things do not break without a reason and when they do, they serve as opportunity to learn something new.
I appreciate your repository and when I stall, it is the first place I look for alternatives. Your packages, just work, but the SBo repo is much larger, and keeping track with all the updates on both repositories (and checking for conflicts) is beyond my resources right now. So please do accept both my gratitude for your work and also my preferences, even if you think that they are incoherent.