That may be true for libraries supplied with NetBSD. I would expect that libraries in pkgsrc compiled with NetBSD 5 headers will not play well programs/libraries in pkgsrc compiled with NetBSD 6 headers, because there's no change in soname for those libraries when built in different environments.
Indeed. Actually it kind of broke my pkgsrc-installation after upgrading from 5 to 6, when I tried a kind of rolling-replace, instead of moving the old /usr/pkg out of the way and building everything from scratch. The errors that come up in such an attempt are very interesting, misleading, and totally useless :) (Who would've guessed :) )
But yes, I admit that I did not choose my word as carefully as I might have should, and obviously this is not the issue here in this case, after all, as it has always been a 6ish system...
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