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	#! /bin/bash

	#Package-specific:>

	GENERATOR=EvtGen
	#VERSION=11

	# === Default values of input parameters ====
	PATH_TO_EXTERNAL=
	CLHEP_VERSION=
	PYTHIADIR=${PYTHIADIR}
	PHOTOSDIR=${PHOTOSDIR}
	TAUOLADIR=${TAUOLADIR}
	HEPMCDIR=${HEPMCDIR}
	COMPMODE=OPT # Default: compiler optimization mode

	#<

	#--------------------------------------------------------------

	check_arguments () {
	for arg in $* ; do
	if [ "x$arg" = "x--enable-debug" ] ; then
	COMPMODE=DBG
	elif [ "x$arg" = "x--help" ] ; then
	echo -e \
	"\nUsage: ./configure [options] , where options are:\n\n"\
	"--help : prints this help\n"\
	"--pythiadir=[full directory path] : specifies location of Pythia 8 base directory\n"\
	"--hepmcdir=[full directory path] : specifies location of HepMC base directory\n"\
	"--photosdir=[full directory path] : specifies location of PHOTOS base directory\n"\
	"--tauoladir=[full directory path] : specifies location of TAUOLA base directory\n"\
	"--enable-debug : turns on debugging flags\n"
	exit
	else
	if [ "x${arg}" = "x${arg/=/}" ] ; then
	echo "${arg}: wrong option. Ignored." >&2
	else
	option=${arg/=*/}
	value=${arg/*=/}
	if [ "x${option}" = "x--pythiadir" ] ; then
	PYTHIADIR=${value}
	elif [ "x${option}" = "x--hepmcdir" ] ; then
	HEPMCDIR=${value}
	elif [ "x${option}" = "x--photosdir" ] ; then
	PHOTOSDIR=${value}
	elif [ "x${option}" = "x--tauoladir" ] ; then
	TAUOLADIR=${value}
	else
	echo "${arg}: wrong option. Ignored." >&2
	fi
	fi
	fi
	done
	return
	}

	#---------------------------------------

	# Check that we can see (some of) the header files for the external generators.
	# If not, print a warning message and ask the user to re-run configure
	# specifying the base directory correct location(s).

	check_dirs() {

	pythiaFile=${PYTHIADIR}/include/Pythia.h
	hepmcFile=${HEPMCDIR}/include/HepMC/GenParticle.h
	photosFile=${PHOTOSDIR}/include/Photos.h
	tauolaFile=${TAUOLADIR}/include/Tauola.h

	stop=0
	if [ -f $pythiaFile ]; then
	echo "PYTHIADIR set to $PYTHIADIR"
	else
	echo "Please specify the location of the PYTHIA base directory"\
	"using the configure option --pythiadir=[full directory path]"\
	"or set the PYTHIADIR environment variable"
	stop=1
	fi

	if [ -f $hepmcFile ]; then
	echo "HEPMCDIR set to $HEPMCDIR"
	else
	echo "Please specify the location of the HepMC base directory"\
	"using the configure option --hepmcdir=[full directory path]"\
	"or set the HEPMCDIR environment variable"
	stop=1
	fi

	if [ -f $photosFile ]; then
	echo "PHOTOSDIR set to $PHOTOSDIR"
	else
	echo "Please specify the location of the PHOTOS base directory"\
	"using the configure option --photosdir=[full directory path]"\
	"or set the PHOTOSDIR environment variable"
	stop=1
	fi

	if [ -f $tauolaFile ]; then
	echo "TAUOLADIR set to $TAUOLADIR"
	else
	echo "Please specify the location of the TAUOLA base directory"\
	"using the configure option --tauoladir=[full directory path]"\
	"or set the TAUOLADIR environment variable"
	stop=1
	fi

	if [ $stop = 1 ] ; then
	exit
	fi

	}

	#--------------------------------------------------------------

	check_extlibs () {

	# Set default shared libary lists for external packages
	HEPMCLIBLIST="-lHepMC"
	PHOTOSLIBLIST="-lPhotosCxxInterface"
	TAUOLALIBLIST="-lTauolaCxxInterface -lTauolaFortran"
	PYTHIALIBLIST="-lpythia8 -llhapdfdummy -lhepmcinterface"

	# Check if the extra Photos fortran library is present.
	# If so, add it to the list of external libraries.
	# This is usually the case for CERN Genser libraries.
	photosFortLib=${PHOTOSDIR}/lib/libPhotosFortran.so;
	if [ -f $photosFortLib ]; then
	PHOTOSLIBLIST+=" -lPhotosFortran"
	fi

	}

	#-------------------------------------------------------------

	check_arguments $*
	check_dirs
	check_extlibs

	echo "Compilation mode is ${COMPMODE}"

	#Package-specific:>

	#
	# User-changeable part, experts -----------------------------
	#
	CXX=g++
	CXXFLAGS_OPT="-O2 -Wall"
	CXXFLAGS_DBG="-g -Wall"
	CFLAGS_OPT=-O2
	CFLAGS_DBG=-g
	FC=gfortran
	FFLAGS_OPT="-O2 -Wuninitialized"
	FFLAGS_DBG=-g

	FFLAGSSHARED=-fPIC
	CFLAGSSHARED=-fPIC
	CXXFLAGSSHARED=-fPIC

	LDFLAGSSHARED="${CXXFLAGS_OPT} -pthread -fPIC"

	#
	# Find platform.
	#
	ARCH=`uname`
	theGcc=`g++ --version \| grep '[0-9]\.[0-9]\.[0-9]' -o \| head -1 \| awk -F . '{print $1}'`
	if [ ${theGcc} = 4 ]; then
	ARCH=${ARCH}-gcc4
	fi
	echo "Platform is $ARCH"

	#default platform settings:
	FFLAGS="${FFLAGS_OPT}"
	CFLAGS="${CFLAGS_OPT}"
	CXXFLAGS="${CXXFLAGS_OPT}"
	FLIBS="-lfrtbegin -lg2c"

	if [ ${COMPMODE} = OPT ]; then
	FFLAGS="${FFLAGS_OPT}"
	CFLAGS="${CFLAGS_OPT}"
	CXXFLAGS="${CXXFLAGS_OPT}"
	fi
	if [ ${COMPMODE} = DBG ]; then
	FFLAGS="${FFLAGS_DBG}"
	CFLAGS="${CFLAGS_DBG}"
	CXXFLAGS="${CXXFLAGS_DBG}"
	fi
	if [ $ARCH = Linux ]; then
	FFLAGS="${FFLAGS_OPT} -Wno-globals"
	CFLAGS="${CFLAGS_OPT}"
	CXXFLAGS="${CXXFLAGS_OPT}"
	FLIBS="-lfrtbegin -lg2c"
	if [ ${COMPMODE} = OPT ]; then
	FFLAGS="${FFLAGS_OPT}"
	CFLAGS="${CFLAGS_OPT}"
	CXXFLAGS="${CXXFLAGS_OPT}"
	fi
	if [ ${COMPMODE} = DBG ]; then
	FFLAGS="${FFLAGS_DBG} -Wno-globals"
	CFLAGS="${CFLAGS_DBG}"
	CXXFLAGS="${CXXFLAGS_DBG}"
	fi
	fi

	# Linux platform with gcc4: new Fortran90 compiler.
	if [ $ARCH = Linux-gcc4 ]; then
	FFLAGS="${FFLAGS_OPT}"
	CFLAGS="${CFLAGS_OPT}"
	CXXFLAGS="${CXXFLAGS_OPT}"
	FLIBS="-lgfortran -lgfortranbegin"
	if [ ${COMPMODE} = OPT ]; then
	FFLAGS="${FFLAGS_OPT}"
	CFLAGS="${CFLAGS_OPT}"
	CXXFLAGS="${CXXFLAGS_OPT}"
	fi
	if [ ${COMPMODE} = DBG ]; then
	FFLAGS="${FFLAGS_DBG}"
	CFLAGS="${CFLAGS_DBG}"
	CXXFLAGS="${CXXFLAGS_DBG}"
	fi
	fi

	#Platform & opt/dbg - independent flags and variables:

	echo -n "Creating config.mk ... "

	rm -f config.mk

	cat > config.mk << EOT

	GENERATOR = ${GENERATOR}
	#VERSION = ${VERSION}

	SHELL = /bin/bash
	ARCH = ${ARCH}
	LCGPLATFORM = ${LCGPLATFORM}
	FC = ${FC}
	FFLAGS = ${FFLAGS}
	CFLAGS = ${CFLAGS}
	CXX = ${CXX}
	CXXFLAGS = ${CXXFLAGS}

	EVTGENDIR = $(pwd)

	TMPDIR = \$(EVTGENDIR)/tmp
	INCLUDEDIR = \$(EVTGENDIR)
	PYTHIADIR = ${PYTHIADIR}
	PYTHIAINCDIR = ${PYTHIADIR}/include
	PYTHIALIBDIR = ${PYTHIADIR}/lib/archive
	PYTHIASHLIBDIR = ${PYTHIADIR}/lib
	PYTHIALIBLIST = ${PYTHIALIBLIST}
	HEPMCDIR = ${HEPMCDIR}
	HEPMCINCDIR = ${HEPMCDIR}/include
	HEPMCLIBDIR = ${HEPMCDIR}/lib
	HEPMCSHLIBDIR = ${HEPMCDIR}/lib
	HEPMCLIBLIST = ${HEPMCLIBLIST}
	PHOTOSDIR = ${PHOTOSDIR}
	PHOTOSINCDIR = ${PHOTOSDIR}/include
	PHOTOSLIBDIR = ${PHOTOSDIR}/lib
	PHOTOSSHLIBDIR = ${PHOTOSDIR}/lib
	PHOTOSLIBLIST = ${PHOTOSLIBLIST}
	TAUOLADIR = ${TAUOLADIR}
	TAUOLAINCDIR = ${TAUOLADIR}/include
	TAUOLALIBDIR = ${TAUOLADIR}/lib
	TAUOLASHLIBDIR = ${TAUOLADIR}/lib
	TAUOLALIBLIST = ${TAUOLALIBLIST}
	SRCDIR = \$(EVTGENDIR)/src
	LIBDIR_SHARED = \$(EVTGENDIR)/lib
	LIBDIR_ARCHIVE = \$(EVTGENDIR)/lib/archive

	LIB_SHARED = \$(LIBDIR_SHARED)/lib\$(GENERATOR).so
	LIB_ARCHIVE = \$(LIBDIR_ARCHIVE)/lib\$(GENERATOR).a

	# flags:
	#
	FFLAGSSHARED = ${FFLAGSSHARED}
	CFLAGSSHARED = ${CFLAGSSHARED}
	CXXFLAGSSHARED = ${CXXFLAGSSHARED}

	LDFLAGSSHARED = ${LDFLAGSSHARED}

	FLIBS = ${FLIBS}

	#Package-specific:>

	#<
	EOT

	echo " done"

	set -v
	mkdir -p tmp/ tmp/EvtGenBase tmp/EvtGenModels lib/ lib/archive/
	set +v

	echo -e "\n\nType 'make' to build everything or 'make help' to list build targets.\n\n"

	exit

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