Import Pythia 8.304

from http://home.thep.lu.se/~torbjorn/pythia8/pythia8304.tgz

AUTHORS

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+AUTHORS:
+Christian Bierlich <christian.bierlich@thep.lu.se>
+Nishita Desai <desai@theory.tifr.res.in>
+Leif Gellersen <leif.gellersen@thep.lu.se>
+Ilkka Helenius <ilkka.m.helenius@jyu.fi>
+Philip Ilten <philten@cern.ch>
+Leif Lonnblad <leif.lonnblad@thep.lu.se>
+Stephen Mrenna <mrenna@fnal.gov>
+Stefan Prestel <stefan.prestel@thep.lu.se>
+Christian Preuss <christian.preuss@monash.edu>
+Torbjorn Sjostrand <torbjorn@thep.lu.se>
+Peter Skands <peter.skands@monash.edu>
+Marius Utheim <marius.utheim@thep.lu.se>
+Rob Verheyen <r.verheyen@ucl.ac.uk>
+
+FORMER AUTHORS:
+Stefan Ask
+Jesper Roy Christiansen
+Richard Corke
+Nadine Fischer
+Christine O. Rasmussen

GUIDELINES

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+
+              MCNET GUIDELINES
+
+      for Event Generator Authors and Users
+
+
+    PREAMBLE
+
+This generator has been developed as part of an academic research
+project and is the result of many years of work by the authors.
+Proper academic recognition is a requirement for its continued
+development.
+
+The components of the program have been developed to work together
+as a coherent physics framework. We believe that the creation of
+separately maintained forks or piecewise distribution of individual
+parts would diminish their scientific value.
+
+The authors are convinced that software development in a scientific
+context requires full availability of all source code, to further
+progress and to allow local modifications to meet the specific
+requirements of the individual user.
+
+Therefore we have decided to release this program under the GNU
+General Public License (GPL) version 2 (with the option to instead
+follow the terms and conditions of any later version of GPL). This
+ensures that the source code will be available to you and grants you
+the freedom to use and modify the program. You can redistribute your
+modified versions as long as you retain the GPL and respect existing
+copyright notices (see the file 'COPYING' for details).
+
+By using the GPL, we entrust you with considerable freedom and expect
+you to use it wisely, since the GPL does not address the issues in
+the first two paragraphs. To remedy this shortcoming, we have
+formulated the following guidelines relevant for the distribution
+and usage of event generator software in an academic setting.
+
+
+    GUIDELINES
+
+1) The integrity of the program should be respected.
+    -------------------------------------------------
+
+1.1) Suspected bugs and proposed fixes should be reported back to the
+    original authors to be considered for inclusion in the standard
+    distribution.  No independently developed and maintained forks
+    should be created as long as the original authors actively work on
+    the program.
+
+1.2) The program should normally be redistributed in its entirety.
+    When there are special reasons, an agreement should be sought with
+    the original authors to redistribute only specific parts. This
+    should be arranged such that the redistributed parts remain
+    updated in step with the standard distribution.
+
+1.3) Any changes in the code must be clearly marked in the source
+   (reason, author, date) and documented. If any modified version is
+   redistributed it should be stated at the point of distribution
+   (download link) that it has been modified and why.
+
+1.4) If a significant part of the code is used by another program,
+    this should be clearly specified in that program's documentation and
+    stated at its point of distribution.
+
+1.5) Copyright information and references may not be removed.
+    Copyright-related program messages may not be altered and must be
+    printed even if only a part of the program is used. Adding further
+    messages specifying any modifications is encouraged.
+
+
+2) The program and its physics should be properly cited when used for
+    academic publications
+    ------------------------------------------------------------------
+
+2.1) The main software reference as designated by the program authors
+    should always be cited.
+
+2.2) In addition, the original literature on which the program is based
+    should be cited to the extent that it is of relevance for a study,
+    applying the same threshold criteria as for other literature.
+
+2.3) When several programs are combined, they should all be mentioned,
+    commensurate with their importance for the physics study at hand.
+
+2.4) To make published results reproducible, the exact versions of the
+    codes that were used and any relevant program and parameter
+    modifications should be spelled out.
+
+
+    POSTSCRIPT
+
+The copyright license of the software is the GPL v2 alone, therefore
+the above guidelines are not legally binding. However, we reserve the
+right to criticize offenders. The guidelines should always be combined
+with common sense, for interpretation and for issues not covered.
+Enquiries regarding the guidelines and related issues are encouraged
+and should be directed to the authors of the program.
+
+Please note that the program, including all its code and documentation,
+is intended for academic use and is delivered "as is" to be used at
+your own risk, without any guarantees.
+
+----------------------------------------------------------------------
+
+These guidelines were edited by Nils Lavesson and David Grellscheid
+for the MCnet collaboration, which has approved and agreed to respect
+them.  MCnet is a Marie Curie Research Training Network funded under
+Framework Programme 6 contract MRTN-CT-2006-035606.

Makefile

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+# Makefile is a part of the PYTHIA event generator.
+# Copyright (C) 2021 Torbjorn Sjostrand.
+# PYTHIA is licenced under the GNU GPL v2 or later, see COPYING for details.
+# Please respect the MCnet Guidelines, see GUIDELINES for details.
+# Author: Philip Ilten, October 2014 - November 2017.
+#
+# This is is the Makefile used to build PYTHIA on POSIX systems.
+# Example usage is:
+#     make -j2
+# For help using the make command please consult the local system documentation,
+# i.e. "man make" or "make --help".
+
+################################################################################
+# VARIABLES: Definition of the relevant variables from the configuration script
+# and the distribution structure.
+################################################################################
+
+# Set the shell.
+SHELL=/usr/bin/env bash
+
+# Include the configuration and set the local directory structure.
+ifeq (,$(findstring clean, $(MAKECMDGOALS)))
+  ifneq (Makefile.inc,$(MAKECMDGOALS))
+    LOCAL_CFG:=$(shell $(MAKE) Makefile.inc))
+    include Makefile.inc
+  endif
+endif
+LOCAL_BIN=bin/
+LOCAL_DOCS=AUTHORS COPYING GUIDELINES README ../../examples/Makefile.inc
+LOCAL_EXAMPLE=examples
+LOCAL_INCLUDE=include
+LOCAL_LIB=lib
+LOCAL_SHARE=share/Pythia8
+LOCAL_SRC=src
+LOCAL_TMP=tmp
+LOCAL_MKDIRS:=$(shell mkdir -p $(LOCAL_TMP) $(LOCAL_LIB))
+CXX_COMMON:=-I$(LOCAL_INCLUDE) $(CXX_COMMON)
+OBJ_COMMON:=-MD $(CXX_COMMON) $(OBJ_COMMON)
+LIB_COMMON=-Wl,-rpath,../lib:$(PREFIX_LIB) -ldl $(GZIP_LIB)
+
+# PYTHIA.
+OBJECTS=$(patsubst $(LOCAL_SRC)/%.cc,$(LOCAL_TMP)/%.o,\
+	$(sort $(wildcard $(LOCAL_SRC)/*.cc)))
+TARGETS=$(LOCAL_LIB)/libpythia8.a $(LOCAL_LIB)/libpythia8$(LIB_SUFFIX)
+
+# LHAPDF.
+ifeq ($(LHAPDF5_USE),true)
+  TARGETS+=$(LOCAL_LIB)/libpythia8lhapdf5.so
+endif
+ifeq ($(LHAPDF6_USE),true)
+  TARGETS+=$(LOCAL_LIB)/libpythia8lhapdf6.so
+endif
+
+# POWHEG (needs directory that contains just POWHEG binaries and scripts).
+ifeq ($(POWHEG_USE),true)
+  ifneq ($(POWHEG_BIN),./)
+    TARGETS+=$(patsubst $(POWHEG_BIN)%,$(LOCAL_LIB)/libpythia8powheg%.so,\
+             $(wildcard $(POWHEG_BIN)*))
+  endif
+endif
+
+# MG5 matrix element plugins.
+ifeq ($(MG5MES_USE),true)
+  TARGETS+=mg5mes
+endif
+
+# Python.
+ifeq ($(PYTHON_USE),true)
+  TARGETS+=python
+endif
+
+################################################################################
+# RULES: Definition of the rules used to build PYTHIA.
+################################################################################
+
+# Rules without physical targets (secondary expansion for documentation).
+.SECONDEXPANSION:
+.PHONY: all install clean distclean mg5mes python
+
+# All targets.
+all: $(TARGETS) $(addprefix $(LOCAL_SHARE)/, $(LOCAL_DOCS))
+
+# The documentation.
+$(addprefix $(LOCAL_SHARE)/, $(LOCAL_DOCS)): $$(notdir $$@)
+	cp $^ $@
+
+# The Makefile configuration.
+Makefile.inc:
+	./configure
+
+# Auto-generated (with -MD flag) dependencies.
+-include $(LOCAL_TMP)/*.d $(LOCAL_TMP)/mg5mes/*.d
+
+# PYTHIA.
+$(LOCAL_TMP)/Pythia.o: $(LOCAL_SRC)/Pythia.cc Makefile.inc
+	$(CXX) $< -o $@ -c $(OBJ_COMMON) -DXMLDIR=\"$(PREFIX_SHARE)/xmldoc\"
+$(LOCAL_TMP)/Streams.o: $(LOCAL_SRC)/Streams.cc Makefile.inc
+	$(CXX) $< -o $@ -c $(OBJ_COMMON)
+$(LOCAL_TMP)/%.o: $(LOCAL_SRC)/%.cc
+	$(CXX) $< -o $@ -c $(OBJ_COMMON)
+$(LOCAL_LIB)/libpythia8.a: $(OBJECTS)
+	ar cr $@ $^
+$(LOCAL_LIB)/libpythia8$(LIB_SUFFIX): $(OBJECTS)
+	$(CXX) $^ -o $@ $(CXX_COMMON) $(CXX_SHARED) $(CXX_SONAME)$(notdir $@)\
+	  $(LIB_COMMON)
+
+# LHAPDF (turn off all warnings for readability).
+$(LOCAL_TMP)/LHAPDF%Plugin.o: $(LOCAL_INCLUDE)/Pythia8Plugins/LHAPDF%.h
+	$(CXX) -x c++ $< -o $@ -c -MD -w $(CXX_COMMON) $(LHAPDF$*_INCLUDE)
+$(LOCAL_LIB)/libpythia8lhapdf%.so: $(LOCAL_TMP)/LHAPDF%Plugin.o\
+	$(LOCAL_LIB)/libpythia8$(LIB_SUFFIX)
+	$(CXX) $< -o $@ $(CXX_COMMON) $(CXX_SHARED) $(CXX_SONAME)$(notdir $@)\
+	 $(LHAPDF$*_LIB) -lLHAPDF -Llib -lpythia8
+
+# POWHEG (exclude any executable ending with sh).
+$(LOCAL_TMP)/LHAPowheg.o: $(LOCAL_INCLUDE)/Pythia8Plugins/LHAPowheg.h
+	$(CXX) -x c++ $< -o $@ -c -MD -w $(CXX_COMMON)
+$(LOCAL_LIB)/libpythia8powheg%sh.so: $(POWHEG_BIN)%sh;
+$(LOCAL_LIB)/libpythia8powheg%.so: $(POWHEG_BIN)% $(LOCAL_TMP)/LHAPowheg.o\
+	$(LOCAL_LIB)/libpythia8$(LIB_SUFFIX)
+	ln -s $< $(notdir $<); $(CXX) $(notdir $<) $(LOCAL_TMP)/LHAPowheg.o\
+	 -o $@ $(CXX_COMMON) $(CXX_SHARED) -Llib -lpythia8\
+	 $(CXX_SONAME)$(notdir $@) -Wl,-rpath,$(POWHEG_BIN); rm $(notdir $<)
+
+# MG5 matrix element plugins.
+mg5mes:
+	cd $(MG5MES_BIN) && $(MAKE)
+
+# Python.
+python: $(LOCAL_LIB)/libpythia8$(LIB_SUFFIX)
+	cd plugins/python && $(MAKE)
+
+# Install.
+install: all
+	mkdir -p $(PREFIX_BIN) $(PREFIX_INCLUDE) $(PREFIX_LIB) $(PREFIX_SHARE)
+	rsync -a $(LOCAL_BIN)/* $(PREFIX_BIN)
+	rsync -a $(LOCAL_INCLUDE)/* $(PREFIX_INCLUDE)
+	rsync -a $(LOCAL_LIB)/* $(PREFIX_LIB)
+	rsync -a $(LOCAL_SHARE)/* $(PREFIX_SHARE)
+	rsync -a $(LOCAL_EXAMPLE) $(PREFIX_SHARE)
+
+# Clean.
+clean:
+	cd plugins/python && $(MAKE) clean
+	cd plugins/mg5mes && $(MAKE) clean
+	rm -rf $(LOCAL_TMP) $(LOCAL_LIB)
+	rm -f $(LOCAL_EXAMPLE)/*Dct.*
+	rm -f $(LOCAL_EXAMPLE)/*[0-9][0-9]
+	rm -f $(LOCAL_EXAMPLE)/weakbosons.lhe
+	rm -f $(LOCAL_EXAMPLE)/hist.root
+
+# Clean all temporary and generated files.
+distclean: clean
+	find . -type f -name Makefile.inc -print0 | xargs -0 rm -f
+	find . -type f -name "*~" -print0 | xargs -0 rm -f
+	find . -type f -name "#*" -print0 | xargs -0 rm -f
+	rm -rf $(LOCAL_BIN)
+	rm -f $(LOCAL_SHARE)/AUTHORS
+	rm -f $(LOCAL_SHARE)/COPYING
+	rm -f $(LOCAL_SHARE)/GUIDELINES
+	rm -f $(LOCAL_SHARE)/README