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This is caused by API changes in v8.
added a commit
Mar 15, 2015
The following commit seems to be the first one in v8 to introduce version information as an include header: v8/v8@9dac60a
So I guess WeeChat could support v8 versions >= 4.3.0 and <= 3.24.3 (implicitly as the "no version information" fallback).
Of course this would leave some versions in between which will remain unsupported forever but I suppose that's still better than only supporting those old versions forever.