If memory serves me right, Ralf S. Engelschall wrote: > Directly jumping from 4 to 6 might work similar to the 4 to 5 procedure > but I've never tried this.
No. Source-upgrading to 6.X can only be done from 5.3-RELEASE (or newer RELENG_5). So somebody trying to do a source upgrade from 4.X needs to do it in two steps. But in general for such a "large" upgrade I'd strongly urge backing up all data, wiping the disk(s), and reinstalling + restoring. (For what it's worth, I specifically recommended this in the 5.X Early Adopters Guide.) Cheers, Bruce.
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