The workaround would be to:
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check in your buildout config to get the url to the Plone versions (http://dist.plone.org/release/4.1.6/versions.cfg in my case)
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copy the Plone versions.cfg to your own buildout
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remove the link to the url, point to this file instead
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update the Zope links in the downloaded file to the dist.plone.org versions. In my case above, the links are:
http://dist.plone.org/versions/zopetoolkit-1-0-7-zopeapp-versions.cfg
http://dist.plone.org/versions/zope-2-13-15-versions.cfg