'sys-apps/help2man' is required and build crashes without it. So it should be declared in build dependencies.
Crash how, logs? Seems to build fine for me (albeit only tried 0.56.12), I even got man pages installed despite: $ help2man bash: help2man: command not found It does "look" for it, but that won't matter if the man pages are pre-generated.
Hmm, indeed. I don't remember how I stumbled upon it. Not reproducable though. The report can be closed.