[Rivet] HepMC, cmake and our bootstrap script

[Hendrik Hoeth]

Thus spake Frank Siegert (frank.siegert at cern.ch):

> > Configure is back in 2.06.09.
> 
> Aaah... even better, thanks for pointing that out!
> 
> So I'll revert the reversion and update it to 2.06.09, and in the
> future whenever we update HepMC versions we'll have to check whether
> configure is gone again.

2.06.09 breaks LCG builds, since that version is not available on AFS.

Pure joy.

-- 
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