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	diff --git a/configure.ac b/configure.ac
	--- a/configure.ac
	+++ b/configure.ac
	@@ -1,203 +1,223 @@
	dnl Process this file with autoconf to produce a configure script.

	AC_PREREQ([2.63])
	AC_INIT([Herwig++],[devel],[herwig@projects.hepforge.org],[Herwig++])
	AC_CONFIG_SRCDIR([Utilities/HerwigStrategy.cc])
	AC_CONFIG_AUX_DIR([Config])
	AC_CONFIG_MACRO_DIR([m4])
	AC_CONFIG_HEADERS([Config/config.h])
	dnl AC_PRESERVE_HELP_ORDER
	AC_CANONICAL_HOST

	case "${host}" in
	-darwin[[0156]].)
	AC_MSG_ERROR([Herwig++ requires OS X 10.3 or later])
	;;
	-darwin7.)
	if test "x$MACOSX_DEPLOYMENT_TARGET" != "x10.3"; then
	AC_MSG_ERROR(
	[Please add 'MACOSX_DEPLOYMENT_TARGET=10.3' to the configure line.])
	fi
	;;
	esac

	dnl === disable debug symbols by default =====
	if test "x$CXXFLAGS" = "x"; then
	CXXFLAGS=-O3
	fi
	if test "x$CFLAGS" = "x"; then
	CFLAGS=-O3
	fi
	dnl Looptools manual requires optimization off
	if test "x$FCFLAGS" = "x"; then
	FCFLAGS=-O0
	fi
	dnl ==========================================

	AC_LANG([C++])

	AM_INIT_AUTOMAKE([1.11 subdir-objects gnu dist-bzip2 -Wall])
	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
	m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

	+dnl Checks for C++ compiler. Handle C++11 flags.
	+AC_PROG_CXX([g++])
	+
	+dnl this block can go once we decide to have C++11 always on
	+AC_MSG_CHECKING([whether to include C++11 flag for testing])
	+AC_ARG_ENABLE(stdcxx11,
	+ AC_HELP_STRING([--enable-stdcxx11],
	+ [turn on C++11 flag (only for testing, do not use in production!)]),
	+ [],
	+ [enable_stdcxx11=no]
	+ )
	+
	+
	+if test "x$enable_stdcxx11" = "xyes"; then
	+AC_MSG_RESULT([yes])
	+dnl remove the wrapper if block and "optional" once we decide to have C++11 always on
	+AX_CXX_COMPILE_STDCXX_11([noext],[optional])
	+else
	+AC_MSG_RESULT([no])
	+fi
	+
	dnl Checks for programs.
	-AC_PROG_CXX([g++])
	AC_PROG_INSTALL
	AC_PROG_MAKE_SET
	AC_PROG_LN_S

	dnl modified search order
	AC_PROG_FC([gfortran g95 g77])
	dnl xlf95 f95 fort ifort ifc efc pgf95 lf95 ftn xlf90 f90 pgf90 pghpf epcf90 xlf f77 frt pgf77 cf77 fort77 fl32 af77])
	AC_LANG_PUSH([Fortran])
	AC_MSG_CHECKING([if the Fortran compiler ($FC) works])
	AC_COMPILE_IFELSE(
	AC_LANG_PROGRAM([],[ print *[,]"Hello"]),
	[AC_MSG_RESULT([yes])],
	[AC_MSG_RESULT([no])
	AC_MSG_ERROR([A Fortran compiler is required to build Herwig++.])
	]
	)
	AC_LANG_POP([Fortran])


	LT_PREREQ([2.2.6])
	LT_INIT([disable-static dlopen pic-only])

	dnl ####################################
	dnl ####################################

	dnl for Doc/fixinterfaces.pl
	AC_PATH_PROG(PERL, perl)

	HERWIG_CHECK_GSL

	HERWIG_CHECK_THEPEG

	BOOST_REQUIRE
	BOOST_FIND_HEADER([boost/array.hpp])
	BOOST_FIND_HEADER([boost/numeric/ublas/io.hpp])
	BOOST_FIND_HEADER([boost/numeric/ublas/matrix.hpp])
	BOOST_FIND_HEADER([boost/numeric/ublas/matrix_proxy.hpp])
	BOOST_FIND_HEADER([boost/numeric/ublas/matrix_sparse.hpp])
	BOOST_FIND_HEADER([boost/numeric/ublas/symmetric.hpp])
	BOOST_FIND_HEADER([boost/numeric/ublas/vector.hpp])
	BOOST_FIND_HEADER([boost/operators.hpp])
	BOOST_FIND_HEADER([boost/progress.hpp])
	BOOST_FIND_HEADER([boost/scoped_array.hpp])
	BOOST_FIND_HEADER([boost/scoped_ptr.hpp])
	BOOST_FIND_HEADER([boost/utility.hpp])

	HERWIG_COMPILERFLAGS

	HERWIG_LOOPTOOLS

	HERWIG_PDF_PATH

	FASTJET_CHECK_FASTJET

	HERWIG_VERSIONSTRING

	HERWIG_CHECK_ABS_BUG

	HERWIG_ENABLE_MODELS

	HERWIG_ENABLE_DIPOLE

	SHARED_FLAG=-shared
	AM_CONDITIONAL(NEED_APPLE_FIXES,
	[test "xx${host/darwin/foundit}xx" != "xx${host}xx"])
	if test "xx${host/darwin/foundit}xx" != "xx${host}xx"; then
	APPLE_DSO_FLAGS=-Wl,-undefined,dynamic_lookup
	SHARED_FLAG=-bundle
	fi
	AC_SUBST([APPLE_DSO_FLAGS])
	AC_SUBST([SHARED_FLAG])

	AC_CONFIG_FILES([UnderlyingEvent/Makefile
	Models/Makefile
	Models/StandardModel/Makefile
	Models/RSModel/Makefile
	Models/General/Makefile
	Models/Susy/Makefile
	Models/Susy/NMSSM/Makefile
	Models/Susy/RPV/Makefile
	Models/UED/Makefile
	Models/LH/Makefile
	Models/LHTP/Makefile
	Models/Transplanckian/Makefile
	Models/Leptoquarks/Makefile
	Models/Zprime/Makefile
	Models/TTbAsymm/Makefile
	Models/Feynrules/Makefile
	Models/Feynrules/python/Makefile-FR
	Models/ADD/Makefile
	Models/Sextet/Makefile
	Decay/Makefile
	Decay/FormFactors/Makefile
	Decay/Tau/Makefile
	Decay/Baryon/Makefile
	Decay/VectorMeson/Makefile
	Decay/Perturbative/Makefile
	Decay/ScalarMeson/Makefile
	Decay/TensorMeson/Makefile
	Decay/WeakCurrents/Makefile
	Decay/Partonic/Makefile
	Decay/General/Makefile
	Decay/Radiation/Makefile
	Doc/refman.conf
	Doc/refman.h
	PDT/Makefile
	PDF/Makefile
	MatrixElement/Makefile
	MatrixElement/General/Makefile
	MatrixElement/Lepton/Makefile
	MatrixElement/Hadron/Makefile
	MatrixElement/DIS/Makefile
	MatrixElement/Powheg/Makefile
	MatrixElement/Gamma/Makefile
	MatrixElement/Matchbox/Makefile
	MatrixElement/Matchbox/Base/Makefile
	MatrixElement/Matchbox/Utility/Makefile
	MatrixElement/Matchbox/Phasespace/Makefile
	MatrixElement/Matchbox/Dipoles/Makefile
	MatrixElement/Matchbox/InsertionOperators/Makefile
	MatrixElement/Matchbox/Matching/Makefile
	MatrixElement/Matchbox/Builtin/Makefile
	MatrixElement/Matchbox/Builtin/Amplitudes/Makefile
	MatrixElement/Matchbox/External/Makefile
	MatrixElement/Matchbox/External/BLHAGeneric/Makefile
	MatrixElement/Matchbox/Tests/Makefile
	Exsample2/Makefile
	Shower/Makefile
	DipoleShower/Makefile
	DipoleShower/Base/Makefile
	DipoleShower/Kernels/Makefile
	DipoleShower/Kinematics/Makefile
	DipoleShower/Utility/Makefile
	DipoleShower/AlphaS/Makefile
	Utilities/Makefile
	Hadronization/Makefile
	lib/Makefile
	include/Makefile
	src/Makefile
	src/defaults/Makefile
	src/herwig-config
	Doc/Makefile
	Doc/HerwigDefaults.in
	Looptools/Makefile
	Analysis/Makefile
	src/Makefile-UserModules
	src/defaults/Analysis.in
	Contrib/Makefile
	Contrib/make_makefiles.sh
	Tests/Makefile
	Makefile])

	AC_CONFIG_FILES([Doc/fixinterfaces.pl],[chmod +x Doc/fixinterfaces.pl])

	HERWIG_OVERVIEW

	AC_CONFIG_COMMANDS([summary],[cat config.herwig])

	AC_OUTPUT
	diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4
	new file mode 100644
	--- /dev/null
	+++ b/m4/ax_cxx_compile_stdcxx_11.m4
	@@ -0,0 +1,133 @@
	+# ============================================================================
	+# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
	+# ============================================================================
	+#
	+# SYNOPSIS
	+#
	+# AX_CXX_COMPILE_STDCXX_11([ext\|noext],[mandatory\|optional])
	+#
	+# DESCRIPTION
	+#
	+# Check for baseline language coverage in the compiler for the C++11
	+# standard; if necessary, add switches to CXXFLAGS to enable support.
	+#
	+# The first argument, if specified, indicates whether you insist on an
	+# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
	+# -std=c++11). If neither is specified, you get whatever works, with
	+# preference for an extended mode.
	+#
	+# The second argument, if specified 'mandatory' or if left unspecified,
	+# indicates that baseline C++11 support is required and that the macro
	+# should error out if no mode with that support is found. If specified
	+# 'optional', then configuration proceeds regardless, after defining
	+# HAVE_CXX11 if and only if a supporting mode is found.
	+#
	+# LICENSE
	+#
	+# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
	+# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
	+# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
	+#
	+# Copying and distribution of this file, with or without modification, are
	+# permitted in any medium without royalty provided the copyright notice
	+# and this notice are preserved. This file is offered as-is, without any
	+# warranty.
	+
	+#serial 3
	+
	+m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
	+ template <typename T>
	+ struct check
	+ {
	+ static_assert(sizeof(int) <= sizeof(T), "not big enough");
	+ };
	+
	+ typedef check<check<bool>> right_angle_brackets;
	+
	+ int a;
	+ decltype(a) b;
	+
	+ typedef check<int> check_type;
	+ check_type c;
	+ check_type&& cr = static_cast<check_type&&>(c);
	+
	+ auto d = a;
	+])
	+
	+AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
	+ m4_if([$1], [], [],
	+ [$1], [ext], [],
	+ [$1], [noext], [],
	+ [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl
	+ m4_if([$2], [], [ax_cxx_compile_cxx11_required=true],
	+ [$2], [mandatory], [ax_cxx_compile_cxx11_required=true],
	+ [$2], [optional], [ax_cxx_compile_cxx11_required=false],
	+ [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])])dnl
	+ AC_LANG_PUSH([C++])dnl
	+ ac_success=no
	+ AC_CACHE_CHECK(whether $CXX supports C++11 features by default,
	+ ax_cv_cxx_compile_cxx11,
	+ [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
	+ [ax_cv_cxx_compile_cxx11=yes],
	+ [ax_cv_cxx_compile_cxx11=no])])
	+ if test x$ax_cv_cxx_compile_cxx11 = xyes; then
	+ ac_success=yes
	+ fi
	+
	+ m4_if([$1], [noext], [], [dnl
	+ if test x$ac_success = xno; then
	+ for switch in -std=gnu++11 -std=gnu++0x; do
	+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
	+ AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
	+ $cachevar,
	+ [ac_save_CXXFLAGS="$CXXFLAGS"
	+ CXXFLAGS="$CXXFLAGS $switch"
	+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
	+ [eval $cachevar=yes],
	+ [eval $cachevar=no])
	+ CXXFLAGS="$ac_save_CXXFLAGS"])
	+ if eval test x\$$cachevar = xyes; then
	+ CXXFLAGS="$CXXFLAGS $switch"
	+ ac_success=yes
	+ break
	+ fi
	+ done
	+ fi])
	+
	+ m4_if([$1], [ext], [], [dnl
	+ if test x$ac_success = xno; then
	+ for switch in -std=c++11 -std=c++0x; do
	+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
	+ AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
	+ $cachevar,
	+ [ac_save_CXXFLAGS="$CXXFLAGS"
	+ CXXFLAGS="$CXXFLAGS $switch"
	+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
	+ [eval $cachevar=yes],
	+ [eval $cachevar=no])
	+ CXXFLAGS="$ac_save_CXXFLAGS"])
	+ if eval test x\$$cachevar = xyes; then
	+ CXXFLAGS="$CXXFLAGS $switch"
	+ ac_success=yes
	+ break
	+ fi
	+ done
	+ fi])
	+ AC_LANG_POP([C++])
	+ if test x$ax_cxx_compile_cxx11_required = xtrue; then
	+ if test x$ac_success = xno; then
	+ AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
	+ fi
	+ else
	+ if test x$ac_success = xno; then
	+ HAVE_CXX11=0
	+ AC_MSG_NOTICE([No compiler with C++11 support was found])
	+ else
	+ HAVE_CXX11=1
	+ AC_DEFINE(HAVE_CXX11,1,
	+ [define if the compiler supports basic C++11 syntax])
	+ fi
	+
	+ AC_SUBST(HAVE_CXX11)
	+ fi
	+])
	diff --git a/m4/herwig.m4 b/m4/herwig.m4
	--- a/m4/herwig.m4
	+++ b/m4/herwig.m4
	@@ -1,384 +1,386 @@
	# check for gcc bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34130
	AC_DEFUN([HERWIG_CHECK_ABS_BUG],
	[
	AC_REQUIRE([HERWIG_COMPILERFLAGS])
	if test "$GCC" = "yes"; then
	AC_MSG_CHECKING([for gcc abs bug])
	AC_RUN_IFELSE([
	AC_LANG_PROGRAM(
	[[ int foo (int i) { return -2 * __builtin_abs(i - 2); } ]],
	[[ if ( foo(1) != -2 \|\| foo(3) != -2 ) return 1; ]]
	)],
	[ AC_MSG_RESULT([not found. Compiler is ok.]) ],
	[
	AC_MSG_RESULT([found. Builtin abs() is buggy.])
	AC_MSG_CHECKING([if -fno-builtin-abs works])
	oldcxxflags=$CXXFLAGS
	CXXFLAGS="$CXXFLAGS -fno-builtin-abs"
	AC_RUN_IFELSE([
	AC_LANG_PROGRAM(
	[[
	#include <cstdlib>
	int foo (int i) { return -2 * std::abs(i - 2); }
	]],
	[[
	if (foo(1) != -2 \|\| foo(3) != -2) return 1;
	]]
	)],
	[
	AC_MSG_RESULT([yes. Setting -fno-builtin-abs.])
	AM_CXXFLAGS="$AM_CXXFLAGS -fno-builtin-abs"
	AM_CFLAGS="$AM_CFLAGS -fno-builtin-abs"
	],
	[
	AC_MSG_RESULT([no. Setting -fno-builtin.])
	AC_MSG_WARN([
	*****************************************************************************
	For this version of gcc, -fno-builtin-abs alone did not work to avoid the
	gcc abs() bug. Instead, all gcc builtin functions are now disabled.
	Update gcc if possible.
	*****************************************************************************])
	AM_CXXFLAGS="$AM_CXXFLAGS -fno-builtin"
	AM_CFLAGS="$AM_CFLAGS -fno-builtin"
	]
	)
	CXXFLAGS=$oldcxxflags
	]
	)
	fi
	])

	dnl ##### THEPEG #####
	AC_DEFUN([HERWIG_CHECK_THEPEG],
	[
	defaultlocation="${prefix}"
	test "x$defaultlocation" = xNONE && defaultlocation="${ac_default_prefix}"
	AC_MSG_CHECKING([for libThePEG in])
	AC_ARG_WITH(thepeg,
	AC_HELP_STRING([--with-thepeg=DIR],[location of ThePEG installation]),
	[],
	[with_thepeg="${defaultlocation}"])
	AC_MSG_RESULT([$with_thepeg])

	if test "x$with_thepeg" = "xno"; then
	AC_MSG_ERROR([Cannot build Herwig++ without ThePEG. Please set --with-thepeg.])
	fi

	THEPEGLDFLAGS="-L${with_thepeg}/lib/ThePEG"
	THEPEGHASLHAPDF="no"
	if test -e ${with_thepeg}/lib/ThePEG/ThePEGLHAPDF.so ; then
	THEPEGHASLHAPDF="yes"
	fi
	if test "${host_cpu}" == "x86_64" -a -e ${with_thepeg}/lib64/ThePEG/libThePEG.so ; then
	THEPEGLDFLAGS="-L${with_thepeg}/lib64/ThePEG"
	if test -e ${with_thepeg}/lib64/ThePEG/ThePEGLHAPDF.so ; then
	THEPEGHASLHAPDF="yes"
	fi
	fi
	THEPEGPATH="${with_thepeg}"

	oldldflags="$LDFLAGS"
	oldlibs="$LIBS"

	LDFLAGS="$LDFLAGS $THEPEGLDFLAGS"
	AC_CHECK_LIB([ThePEG],[debugThePEG],[],
	[AC_MSG_ERROR([No ThePEG libraries in $THEPEGLDFLAGS. Please set --with-thepeg.])])

	AC_SUBST([THEPEGLIB],[-lThePEG])
	AC_SUBST(THEPEGLDFLAGS)
	AC_SUBST(THEPEGPATH)
	AC_SUBST(THEPEGHASLHAPDF)

	LIBS="$oldlibs"
	LDFLAGS="$oldldflags"

	AC_MSG_CHECKING([for ThePEG headers in])
	AC_ARG_WITH([thepeg-headers],
	AC_HELP_STRING([--with-thepeg-headers=DIR],[location of ThePEG include directory]),
	[],
	[with_thepeg_headers="${with_thepeg}/include"])
	AC_MSG_RESULT([$with_thepeg_headers])

	if test "x$with_thepeg_headers" = "xno"; then
	AC_MSG_ERROR([Cannot build Herwig++ without ThePEG headers. Please set --with-thepeg-headers.])
	fi

	THEPEGINCLUDE="-I$with_thepeg_headers"

	oldcppflags="$CPPFLAGS"
	CPPFLAGS="$CPPFLAGS $THEPEGINCLUDE"
	AC_CHECK_HEADER([ThePEG/Config/ThePEG.h],[],
	[AC_MSG_ERROR([No ThePEG headers in $with_thepeg_headers. Please set --with-thepeg-headers.])])
	CPPFLAGS="$oldcppflags"

	AC_SUBST(THEPEGINCLUDE)

	AC_MSG_CHECKING([for HepMCAnalysis.so in ThePEG])


	if test -e "$THEPEGPATH/lib/ThePEG/HepMCAnalysis.so" ; then
	CREATE_HEPMC="create"
	AC_MSG_RESULT([found])
	else
	CREATE_HEPMC="# create"
	AC_MSG_RESULT([not found])
	fi

	AC_SUBST([CREATE_HEPMC])
	])

	dnl ##### LOOPTOOLS #####
	AC_DEFUN([HERWIG_LOOPTOOLS],
	[
	AC_REQUIRE([AC_PROG_FC])
	AC_REQUIRE([AC_FC_LIBRARY_LDFLAGS])
	AC_REQUIRE([AC_PROG_CC])
	AC_REQUIRE([HERWIG_COMPILERFLAGS])

	AC_MSG_CHECKING([if Looptools build works])
	enable_looptools=yes

	if test "x$GCC" = "xyes"; then
	case "${host}" in
	x86_64-\|-darwin1*)
	AM_FCFLAGS="$AM_FCFLAGS -fdefault-integer-8"
	;;
	esac

	AC_LANG_PUSH([Fortran])
	oldFCFLAGS="$FCFLAGS"
	FCFLAGS="$AM_FCFLAGS"
	AC_COMPILE_IFELSE(
	AC_LANG_PROGRAM([],[ print *[,]"Hello"]),
	[],
	[AC_MSG_RESULT([no])
	AC_MSG_ERROR([needs gfortran on 64bit machines])]
	)
	FCFLAGS="$oldFCFLAGS"
	AC_LANG_POP([Fortran])
	fi
	AC_MSG_RESULT([$enable_looptools])

	AC_SUBST([F77],[$FC])
	AC_SUBST([FFLAGS],[$FCFLAGS])
	AC_SUBST([AM_FFLAGS],[$AM_FCFLAGS])
	AC_SUBST([FLIBS],[$FCLIBS])
	])

	dnl ##### PDF PATH #####
	AC_DEFUN([HERWIG_PDF_PATH],
	[
	AC_MSG_CHECKING([which Herwig++ PDF data to use])
	AC_ARG_WITH(pdf,
	AC_HELP_STRING([--with-pdf=DIR],[installation path of Herwig++PDF data tarball]),
	[],
	[with_pdf=${prefix}]
	)
	HERWIG_PDF_PREFIX=${with_pdf}/share/Herwig++PDF

	if test -f "${HERWIG_PDF_PREFIX}/mrst/2008/mrstMCal.dat"; then
	AC_MSG_RESULT([$with_pdf])
	localPDFneeded=false
	else
	AC_MSG_RESULT([Using built-in PDF data set. For other data sets, set --with-pdf.])
	HERWIG_PDF_PREFIX=PDF
	localPDFneeded=true
	fi
	HERWIG_PDF_DEFAULT=${HERWIG_PDF_PREFIX}/mrst/2008/mrstMCal.dat
	HERWIG_PDF_NLO=${HERWIG_PDF_PREFIX}/mrst/2002/mrst2002nlo.dat
	HERWIG_PDF_POMERON=${HERWIG_PDF_PREFIX}/diffraction/

	AM_CONDITIONAL(WANT_LOCAL_PDF,[test "x$localPDFneeded" = "xtrue"])
	AC_SUBST(HERWIG_PDF_DEFAULT)
	AC_SUBST(HERWIG_PDF_NLO)
	AC_SUBST(HERWIG_PDF_POMERON)
	])

	dnl ###### GSL ######
	AC_DEFUN([HERWIG_CHECK_GSL],
	[
	AC_MSG_CHECKING([for gsl location])
	GSLINCLUDE=""
	GSLLIBS=""

	AC_ARG_WITH(gsl,
	AC_HELP_STRING([--with-gsl=DIR],[location of gsl installation @<:@default=system libs@:>@]),
	[],
	[with_gsl=system])

	if test "x$with_gsl" = "xno"; then
	AC_MSG_ERROR([libgsl is required. Please install the GNU scientific library and header files.])
	fi

	if test "x$with_gsl" = "xsystem"; then
	AC_MSG_RESULT([in system libraries])
	oldlibs="$LIBS"
	AC_CHECK_LIB(m,main)
	AC_CHECK_LIB(gslcblas,main)
	AC_CHECK_LIB(gsl,main,[],
	[
	AC_MSG_ERROR([Cannot find libgsl. Please install the GNU scientific library and header files or use --with-gsl=.])
	]
	)
	GSLLIBS="$LIBS"
	LIBS=$oldlibs
	else
	if test "`uname -m`" = "x86_64" -a -e "$with_gsl/lib64/libgsl.a" -a -d "$with_gsl/include/gsl"; then
	AC_MSG_RESULT([found in $with_gsl])
	GSLLIBS="-L$with_gsl/lib64 -R$with_gsl/lib64 -lgslcblas -lgsl"
	GSLINCLUDE="-I$with_gsl/include"
	elif test -e "$with_gsl/lib/libgsl.a" -a -d "$with_gsl/include/gsl"; then
	AC_MSG_RESULT([found in $with_gsl])
	GSLLIBS="-L$with_gsl/lib -R$with_gsl/lib -lgslcblas -lgsl"
	GSLINCLUDE="-I$with_gsl/include"
	else
	AC_MSG_RESULT([not found])
	AC_MSG_ERROR([Can't find $with_gsl/lib/libgsl.a or the headers in $with_gsl/include])
	fi
	fi

	AC_SUBST(GSLINCLUDE)
	AC_SUBST(GSLLIBS)
	])

	AC_DEFUN([HERWIG_VERSIONSTRING],
	[
	if test -d $srcdir/.svn; then
	AC_CHECK_PROG(have_svnversion,[svnversion],[yes],[no])
	fi
	AM_CONDITIONAL(USE_SVNVERSION,[test "x$have_svnversion" = "xyes"])
	])

	dnl ##### COMPILERFLAGS #####
	AC_DEFUN([HERWIG_COMPILERFLAGS],
	[
	AC_REQUIRE([HERWIG_CHECK_GSL])
	AC_REQUIRE([HERWIG_CHECK_THEPEG])
	AC_REQUIRE([BOOST_REQUIRE])

	AM_CPPFLAGS="-I\$(top_builddir)/include $THEPEGINCLUDE \$(GSLINCLUDE) \$(BOOST_CPPFLAGS)"

	AC_MSG_CHECKING([for debugging mode])
	AC_ARG_ENABLE(debug,
	AC_HELP_STRING([--enable-debug],[debug mode, use --enable-debug=slow for additional options that slow down the run.]),
	[],
	[enable_debug=no]
	)
	AC_MSG_RESULT([$enable_debug])

	if test "x$enable_debug" = "xno"; then
	debugflags=""
	else
	debugflags="-g"
	fi

	dnl -Wfloat-equal -fvisibility-inlines-hidden -Wctor-dtor-privacy -Weffc++
	if test -n "$GCC"; then
	warnflags="-ansi -pedantic -Wall -Wextra -Wno-overloaded-virtual"

	if test "x$enable_debug" = "xslow"; then
	debugflags="$debugflags -fno-inline"
	AM_CPPFLAGS="$AM_CPPFLAGS -D_GLIBCXX_DEBUG"
	fi
	fi

	dnl do an actual capability check on ld instead of this workaround
	case "${host}" in
	-darwin)
	;;
	*)
	AM_LDFLAGS="-Wl,--enable-new-dtags"
	;;
	esac

	AC_SUBST(AM_CPPFLAGS)
	AC_SUBST(AM_CFLAGS, ["$warnflags $debugflags"])
	AC_SUBST(AM_CXXFLAGS,["$warnflags $debugflags"])
	AC_SUBST(AM_FCFLAGS, ["$debugflags"])
	AC_SUBST(AM_LDFLAGS)
	])

	AC_DEFUN([HERWIG_ENABLE_MODELS],
	[
	AC_MSG_CHECKING([if BSM models should be built])

	AC_ARG_ENABLE(models,
	AC_HELP_STRING([--disable-models],[Turn off compilation of BSM models.]),
	[],
	[enable_models=yes]
	)
	AC_MSG_RESULT([$enable_models])

	LOAD_BSM=""
	if test "$enable_models" = "yes"; then
	LOAD_BSM="read BSMlibs.in"
	fi
	AC_SUBST(LOAD_BSM)

	AM_CONDITIONAL(WANT_BSM,[test "$enable_models" = "yes"])
	])


	AC_DEFUN([HERWIG_ENABLE_DIPOLE],
	[
	AC_MSG_CHECKING([if dipole shower should be built])

	AC_ARG_ENABLE(dipole,
	AC_HELP_STRING([--disable-dipole],[Turn off compilation of dipole shower.]),
	[],
	[enable_dipole=yes]
	)
	AC_MSG_RESULT([$enable_dipole])

	LOAD_DIPOLE=""
	LOAD_DIPOLE_ALPHAS=""
	LOAD_MATCHBOX=""
	if test "$enable_dipole" = "yes"; then
	WARNLHAPDF=""
	if test "x$THEPEGHASLHAPDF" = "xno" ; then
	AC_MSG_WARN([Dipole shower defaults require LHAPDF])
	WARNLHAPDF=" * warning: LHAPDF disabled * "
	fi
	LOAD_DIPOLE="library HwDipoleShower.so"
	LOAD_DIPOLE_ALPHAS="library HwDipoleShowerAlphaS.so"
	LOAD_MATCHBOX="library HwMatchbox.so"
	fi
	AC_SUBST(LOAD_DIPOLE)
	AC_SUBST(LOAD_DIPOLE_ALPHAS)
	AC_SUBST(LOAD_MATCHBOX)

	AM_CONDITIONAL(WANT_DIPOLE,[test "$enable_dipole" = "yes"])
	])


	AC_DEFUN([HERWIG_OVERVIEW],
	[
	FCSTRING=`$FC --version \| head -1`
	CXXSTRING=`$CXX --version \| head -1`
	CCSTRING=`$CC --version \| head -1`
	cat << _HW_EOF_ > config.herwig
	*****************************************************
	*** $PACKAGE_STRING configuration summary
	*** Please include this information in bug reports!
	***--------------------------------------------------
	*** Prefix: $prefix
	***
	*** BSM models: $enable_models
	*** Dipole shower: $enable_dipole $WARNLHAPDF
	***
	*** Herwig debug mode: $enable_debug
	***
	*** ThePEG: $with_thepeg
	*** ThePEG headers: $with_thepeg_headers
	***
	*** GSL: $with_gsl
	*** boost: ${BOOST_CPPFLAGS:-system}
	*** Fastjet: ${fjconfig}
	***
	*** Host: $host
	*** CC: $CCSTRING
	*** CXX: $CXXSTRING
	*** FC: $FCSTRING
	+***
	+*** CXXFLAGS: $CXXFLAGS
	*****************************************************
	_HW_EOF_
	])

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