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########################################################################
# Copyright 1998-2020 CERN for the benefit of the EvtGen authors #
# #
# This file is part of EvtGen. #
# #
# EvtGen is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# EvtGen is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with EvtGen. If not, see <https://www.gnu.org/licenses/>. #
########################################################################
set(HEPMC2_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of HepMC 2 installation")
set(HEPMC3_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of HepMC 3 installation")
set(PYTHIA8_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of Pythia8 installation")
set(Photos++_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of Photos++ installation")
set(Tauola++_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of Tauola++ installation")
set(PHOTOSPP_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of Photos++ installation - alternative spelling")
set(TAUOLAPP_ROOT_DIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Location of Tauola++ installation - alternative spelling")
# The components we search for in the external generators depend on the version
# of HepMC we're working with
if(EVTGEN_HEPMC3)
find_package(HepMC3 REQUIRED PATHS ${HEPMC3_ROOT_DIR})
if(EVTGEN_PYTHIA)
find_package(Pythia8 REQUIRED)
endif()
if(EVTGEN_PHOTOS)
# From version 3.64 Photos has HepMC3 support
find_package(Photos++ REQUIRED COMPONENTS pp ppHepMC3)
endif()
if(EVTGEN_TAUOLA)
# From version 1.1.8 Tauola has HepMC3 support
find_package(Tauola++ REQUIRED COMPONENTS Fortran CxxInterface HepMC3)
endif()
else()
find_package(HepMC2 REQUIRED)
if(EVTGEN_PYTHIA)
find_package(Pythia8 REQUIRED)
endif()
if(EVTGEN_PHOTOS)
# Photos has different library structures for versions before and after 3.58
# so we need to search for either option: pp+ppHepMC or CxxInterface+Fortran
find_package(Photos++ REQUIRED OPTIONAL_COMPONENTS pp ppHepMC CxxInterface Fortran)
endif()
if(EVTGEN_TAUOLA)
# Older versions of Tauola don't have the HepMC component, the HepMC2 interface is in CxxInterface
find_package(Tauola++ REQUIRED COMPONENTS Fortran CxxInterface OPTIONAL_COMPONENTS HepMC)
endif()
endif()

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