Monte Carlo event generator Formula was removed
Last versions were
pythia8 requires the following formulae to be installed:
hepmc 2.06.09 C++ event record for Monte Carlo generators
lhapdf 6.2.1 PDF interpolation and evaluation
boost 1.66.0 Collection of portable C++ source libraries

Recent formula history

David Hall Travis-CI uses brew test-bot Copied .travis.yml from brew-tap-new script. This should make for quicker testing, because only the edited formula is tested. Also moved formulae to Formula folder.
Christian Johnson Update pythia8.rb
David Hall Style changes
David Hall Split vincia into separate formula
Christian Johnson Updated VINCIA plugin

Formula code at GitHub