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While rebuilding for Python-2.6, libbtctl FTBFS, and it turns out the problem was that old-style ".pub" signature. We'll see how upstream will welcome the patch, but at least that solved the problem for us at Frugalware.
In fact that .pub sign must be ancient, I did the csharp bindings for Pacman-G2 a long time ago and then I already did not use the old form, either.