dnl Run autoreconf -iv to produce the configure script and associated files.
  
  dnl Giac version number
  m4_define([giac_major_version], [1])
  m4_define([giac_minor_version], [4])
  m4_define([giac_micro_version], [9])
  m4_define([giac_version], [giac_major_version.giac_minor_version.giac_micro_version])
  
  dnl Attempt to change archive name made by make dist 
  dnl REVNUM=`date +%Y%m%d`
  dnl AC_SUBST(REVNUM)
  
  
  dnl Giac library ABI versioning information 
  dnl (NOT to be confused with version number) 
  m4_define([giac_lt_current], [0])
  m4_define([giac_lt_age], [0])
  m4_define([giac_lt_revision], [0])
  
  AC_INIT([giac], giac_version)
  AC_PREREQ(2.59)
  AC_CONFIG_MACRO_DIR([m4])
  AC_CONFIG_AUX_DIR([config])
  AC_CONFIG_SRCDIR([src/index.h])
  dnl XXX: gettext hard-codes location of config.h. f@#$!
  AC_CONFIG_HEADERS([config.h])
  AM_INIT_AUTOMAKE([gnu 1.8 dist-bzip2])
  
  dnl AM_MAINTAINER_MODE
  
  dnl AC_GNU_SOURCE
  AC_PROG_CC
  AC_PROG_INSTALL
  AC_PROG_LN_S
  AC_PROG_CXX
  AC_PROG_CXXCPP
  AC_LANG([C++])
  AC_PROG_LIBTOOL
  AC_PROG_YACC
  AM_PROG_LEX
  
  dnl Check for standard C+headers
  GINAC_STD_CXX_HEADERS
  
  dnl Check for GMP
  CONFIG_TOMMATH="no"
  AC_ARG_ENABLE([tommath],
  	[AS_HELP_STRING([--enable-tommath], [Use libtommath instead of GMP [[default=no]]])],
  	[ if test "x$enableval" = "xyes"; then CONFIG_TOMMATH="yes"; fi ], [])
  
  if test "$CONFIG_TOMMATH" = "yes" ; then 
  	AC_DEFINE([USE_GMP_REPLACEMENTS], [], [Replace GMP by tommath])
  	AC_CHECK_HEADERS(tommath.h,AC_CHECK_LIB(tommath,mp_init))
  else
    AC_CHECK_HEADERS(gmp.h,AC_CHECK_LIB(gmp,main))
    dnl Check for MPFR
    AC_CHECK_HEADERS(mpfr.h,AC_CHECK_LIB(mpfr,main))
    AC_CHECK_FUNCS(mpfr_set_str_raw)
    dnl Check for MPFI
    AC_CHECK_HEADERS(mpfi.h,AC_CHECK_LIB(mpfi,main))
  fi
    
    
  dnl Optimization or debug
  CONFIG_DEBUG_P="yes"
  AC_ARG_ENABLE([debug],
  	[AS_HELP_STRING([--enable-debug], [enables debug support [[default=no]] ])],
  	[ if test "x$enableval" = "xno"; then CONFIG_DEBUG_P="no"; fi ], [])
  
  if test "$CONFIG_DEBUG_P" = "yes"; then
  	AC_DEFINE(DEBUG_SUPPORT, ,[Set if debugging is enabled])
    fi
    
    dnl Garbage collector
  CONFIG_GC="no"
  AC_ARG_ENABLE([gc],
  	[AS_HELP_STRING([--enable-gc], [Use Boehm garbage collector [[default=no]]])],
  	[ if test "$enableval" = "yes"; then CONFIG_GC="yes"; fi ], [])
  
  if test "$CONFIG_GC" = "xyes" ; then 
  	AC_CHECK_LIB(gc,GC_malloc_atomic)
    fi
    
  CONFIG_SSCL="no"
    dnl Include semi-classical
  AC_ARG_ENABLE([sscl], [
  	AS_HELP_STRING([--enable-sscl],
  		[enable semi-classical algorithms (not working yet) [[default=no]]])],
  	[ if "x$enableval" = "xyes"; then CONFIG_SSCL="yes"; fi ], [])
    
  if test "x$CONFIG_SSCL" = "xyes"; then 
  	AC_DEFINE(HAVE_SSCL, ,[Set to enable semi-classical routines])
  fi
    
  AC_CHECK_LIB(m, main)
  
  CONFIG_PNG="yes"
  AC_ARG_ENABLE(png,
  	[AS_HELP_STRING([--enable-png], [Enable PNG library])],
  	[ if test "x$enableval" = "xno"; then CONFIG_PNG="no"; fi], [])
    
  if test "x$CONFIG_PNG" = "xyes"; then 
     AC_CHECK_HEADERS(png.h, AC_CHECK_LIB(png,main)) dnl AC_CHECK_LIBS(main,[png16,png14,png12,png]))
  fi
  
    
  dnl Checking for dl
    
  CONFIG_DL="yes"
  AC_ARG_ENABLE(dl,
  	[AS_HELP_STRING([--enable-dl], [Enable dynamically loaded modules])],
  	[ if test "x$enableval" = "xno"; then CONFIG_DL="no"; fi], [])
    
  if test "x$CONFIG_DL" = "xyes"; then 
  	AC_CHECK_LIB(dl, dlopen)
    fi
    
  AC_CHECK_SIZEOF(void *)
  AC_CHECK_SIZEOF(int)
  AC_CHECK_SIZEOF(long)
  AC_CHECK_SIZEOF(long long)
    
  dnl Checking for Gnu Sci Lib
  CONFIG_GSL="yes"
  AC_ARG_ENABLE([gsl],[
  	AS_HELP_STRING([--enable-gsl], [Use GNU scientific library [[default=yes]]])],
  	[ if test "x$enableval" = "xno"; then CONFIG_GSL="no"; fi], [])
  
  if test "$CONFIG_GSL" = "yes"; then
  	AC_CHECK_HEADERS(gsl/gsl_blas.h)
  	AC_CHECK_HEADERS(gsl/gsl_eigen.h)
  	if test "$ac_cv_header_gsl_gsl_blas_h" != "yes" -o "$ac_cv_header_gsl_gsl_eigen_h" != "yes"; then
  		CONFIG_GSL="no"
  	fi
  fi
  if test "$CONFIG_GSL" = "yes"; then
  	save_LIBS="$LIBS"
  	AC_CHECK_LIB(gslcblas, main, [], [CONFIG_GSL="no"])
  	AC_CHECK_LIB(gsl, gsl_sf_gamma, [], [CONFIG_GSL="no"])
  	LIBS="$save_LIBS"
    fi
  GSL_LIBS=""
  if test "$CONFIG_GSL" = "yes"; then
  	GSL_LIBS="-lgsl -lgslcblas"
    fi
  AC_SUBST(CONFIG_GSL)
  AC_SUBST(GSL_LIBS)
  AM_CONDITIONAL(CONFIG_GSL, [test "$CONFIG_GSL" = "yes"])
    
  CONFIG_LAPACK="yes"
  AC_ARG_ENABLE([lapack],
  	[AS_HELP_STRING([--enable-lapack], [Use LAPACK [[default=yes]]])],
  	[ if test "$enableval" = "no"; then CONFIG_LAPACK="no"; fi], [])
    
  if test "$CONFIG_LAPACK" = "yes"; then
  #	AC_CHECK_LIB(f2c, main, [], [CONFIG_LAPACK="no"])
  #	AC_CHECK_LIB(blas, main, [], [CONFIG_LAPACK="no"])
  #	AC_CHECK_LIB(tmglib, main, [], [CONFIG_LAPACK="no"])
  	AC_CHECK_LIB(gfortran, main)
  	AC_CHECK_LIB(blas, main)
  	AC_CHECK_LIB(lapack, main, [], [CONFIG_LAPACK="no"])
  #        AX_BLAS([have_blas=yes],[have_blas=no])
  #        AX_LAPACK([have_lapack=yes],[have_lapack=no])
  fi
    
  CONFIG_PARI="yes"
  AC_ARG_ENABLE([pari],
  	[AS_HELP_STRING([--enable-pari], [Use PARI [[default=yes]]])],
  	[ if test "$enableval" = "no"; then CONFIG_PARI="no"; fi], [])
    
  if test "$CONFIG_PARI" = "yes"; then
  	AC_CHECK_HEADERS(pari/pari.h, [], [CONFIG_PARI="no"])
  fi
  if test "$CONFIG_PARI" = "yes"; then
  	save_LIBS="$LIBS"
  	AC_CHECK_LIB(pari, main, [], [CONFIG_PARI="no"])
  	LIBS="$save_LIBS"
    fi
  PARI_LIBS=""
  if test "$CONFIG_PARI" = "yes"; then
  	PARI_LIBS="-lpari"
  fi
  AC_SUBST(PARI_LIBS)
  AC_SUBST(CONFIG_PARI)
  AM_CONDITIONAL(CONFIG_PARI, [test "$CONFIG_PARI" = "yes"])
    
  dnl Checking for NTL
  CONFIG_NTL="yes"
  AC_ARG_ENABLE([ntl],
  	[AS_HELP_STRING([--enable-ntl], [Use NTL [[default=yes]]])],
  	[if test "$enableval" = "no"; then CONFIG_NTL="no"; fi], [])
  
  if test "$CONFIG_NTL" = "yes"; then
  	AC_CHECK_HEADER(NTL/ZZ.h, [], [CONFIG_NTL="no"])
    fi
  if test "$CONFIG_NTL" = "yes"; then
  	save_LIBS="$LIBS"
  	AC_CHECK_LIB(ntl, main, [], [CONFIG_NTL="no"])
  	LIBS="$save_LIBS"
    fi
  NTL_LIBS=""
  if test "$CONFIG_NTL" = "yes"; then
  	NTL_LIBS="-lntl"
    fi
  AC_SUBST(CONFIG_NTL)
  AC_SUBST(NTL_LIBS)
  AM_CONDITIONAL(CONFIG_NTL, [test "$CONFIG_NTL" = "yes"])
  
  CONFIG_GMPXX="yes"
  AC_ARG_ENABLE([gmpxx],
  	[AS_HELP_STRING([--enable-gmpxx], [Use GMP C+wrappers [[default=yes]]])],
  	[if test "$enableval" = "no"; then CONFIG_GMPXX="no"; fi], [])
  if test "$CONFIG_GMPXX" = "yes"; then 
  	AC_CHECK_HEADERS(gmpxx.h, [], [CONFIG_GMPXX="no"])
    fi
  if test "$CONFIG_GMPXX" = "yes"; then 
  	save_LIBS="$LIBS"
  	AC_CHECK_LIB(gmpxx, main, [], [CONFIG_GMPXX="no"])
  	LIBS="$save_LIBS"
    fi
  GMPXX_LIBS=""
  if test "$CONFIG_GMPXX" = "yes"; then
  	GMPXX_LIBS="-lgmpxx"
    fi
  AC_SUBST(CONFIG_GMPXX)
  AC_SUBST(GMPXX_LIBS)
  AM_CONDITIONAL(CONFIG_GMPXX, [test "$CONFIG_GMPXX" = "yes"])
  
  CONFIG_COCOA="yes"
  AC_ARG_ENABLE([cocoa],
  	[AS_HELP_STRING([--enable-cocoa], [Use CoCoA library [[default=autodetect]]])],
  	[if test "$enableval" = "no"; then CONFIG_COCOA="no"; fi], [])
  
  if test "$CONFIG_COCOA" = "yes"; then
  	AC_CHECK_HEADER(CoCoA/io.H, [], [CONFIG_COCOA="no"])
    fi
  if test "$CONFIG_COCOA" = "yes"; then
  	save_LIBS="$LIBS"
  	AC_CHECK_LIB(cocoa, main, [], [CONFIG_COCOA="no"])
  	LIBS="$save_LIBS"
  fi
  COCOA_LIBS=""
  if test "$CONFIG_COCOA" = "yes"; then
  	COCOA_LIBS="-lcocoa"
  fi
  AC_SUBST(CONFIG_COCOA)
  AC_SUBST(COCOA_LIBS)
  AM_CONDITIONAL(CONFIG_COCOA, [test "$CONFIG_COCOA" = "yes"])
  
  dnl AC_CHECK_LIB(ao, main)
  CONFIG_AO="yes"
  AC_ARG_ENABLE([ao],
  	[AS_HELP_STRING([--enable-ao], [Use AO [[default=yes]]])],
  	[if test "$enableval" = "no"; then CONFIG_AO="no"; fi], [])
  
  if test "$CONFIG_AO" = "yes"; then
  	AC_CHECK_HEADER(ao/ao.h, [], [CONFIG_AO="no"])
    fi
  if test "$CONFIG_AO" = "yes"; then
  	AC_CHECK_LIB(ao, main, [], [CONFIG_AO="no"])
    fi
  AC_SUBST(CONFIG_AO)
  AC_SUBST(AO_LIBS)
  AM_CONDITIONAL(CONFIG_AO, [test "$CONFIG_AO" = "yes"])
  
    
  AC_CANONICAL_HOST
  dnl Check for stuff needed for building the Giac interactive shell (cas).
  GINAC_READLINE
  
  dnl Ugh...
  CONFIG_GUI="yes"
  AC_ARG_ENABLE([gui],
  	[AS_HELP_STRING([--enable-gui], [enable GUI [[default=yes]]])],
  	[ if test "x$enableval" = "xno"; then CONFIG_GUI="no"; fi], [])
  	
  save_LIBS="$LIBS"
  if test "$CONFIG_GUI" = "yes"; then 
  dnl Check for X11 anf fltk or cygwin and fltk...
  	case $host_os in
  		*cygwin*)
  		AC_CHECK_LIB(GL, main)
  dnl		AC_CHECK_LIB(GLU, main)
  		AC_CHECK_LIB(fltk_gl, main)
  		AC_CHECK_LIB(fltk, main)
  		AC_CHECK_LIB(z, main)
  		AC_CHECK_LIB(jpeg, main)
  		AC_CHECK_LIB(fltk_images, main)
  		if test "$HAVE_LIBFLTK" = "1" ; then
  			AC_DEFINE([HAVE_LIBFLVW],1,[Now defined if fltk is available])
  		fi
  		LIBS="$LIBS -mwindows -lole32 -luuid -lcomctl32 -lwsock32"
  		if test "$HAVE_LIBFLTK_GL" = "1" ; then
  		    AC_DEFINE([USE_OPENGL32],1,[Defined if fltk has OpenGL enabled])
  		    LIBS="$LIBS -lglu32 -lopengl32 -lfltk_png"
  		fi
  
  		CXXFLAGS="$CXXFLAGS -DWIN32"
  		AC_CHECK_LIB(intl.dll, main)
  		AC_CHECK_LIB(intl, main)
  		;;
  
  		*darwin*)
  		dnl FLTK does not need X libraries on this platform
  		;;
  		*)
  		AC_PATH_XTRA
  		AC_CHECK_LIB(GL, main)
  dnl		AC_CHECK_LIB(GLU, main)
  		;;
  	esac
  	dnl X11, check for opengl, fltk
  	AC_CHECK_LIB(X11,main)
  	AC_CHECK_LIB(Xinerama, main)
  	AC_CHECK_LIB(fontconfig, main)
  	AC_CHECK_LIB(Xft, main)
  	AC_CHECK_LIB(Xext, main)
  	AC_CHECK_LIB(fltk_gl, main)
  	AC_CHECK_LIB(fltk, main)
  	if test "$HAVE_LIBFLTK" = "1"; then
  	   AC_DEFINE([HAVE_LIBFLVW],1, [Now defined if fltk is available])
  	fi
  	AC_CHECK_LIB(z,main)
  	AC_CHECK_HEADERS(png.h, AC_CHECK_LIB(png,main))
  	AC_CHECK_LIB(jpeg, main)
  	AC_CHECK_LIB(fltk_images, main)
  	GUI_LIBS="$LIBS $X_LIBS"
  	AC_SUBST(GUI_LIBS)
    fi
  LIBS="$save_LIBS"
    
  AC_CHECK_LIB(pthread,main)
  AC_CHECK_HEADERS(pthread.h)
  AC_CHECK_HEADERS(malloc.h)
  AC_CHECK_FUNCS(sysconf)
  AC_CHECK_LIB(rt,clock_gettime)
    
    dnl Checking for hash_map
  AC_CHECK_HEADER(unordered_map, AC_DEFINE(C11_UNORDERED_MAP,1, [Define if <unordered_map> header is available]))
  AC_CHECK_HEADER(ext/hash_map, AC_DEFINE(EXT_HASH_MAP,1, [Define if <ext/hash_map> header is aviailable]))
  AC_CHECK_HEADER(tr1/unordered_map, AC_DEFINE(UNORDERED_MAP,1, [Define if <tr1/unordered_map> header is available]))
  AC_CHECK_HEADER(hash_map,AC_DEFINE(HASH_MAP,1, [Define if <hash_map> header is aviailable]))
  AC_CHECK_HEADERS(pwd.h, ,AC_DEFINE(HAVE_NO_PWD_H,1, [Set if pwd.h is NOT available]))
  AC_CHECK_HEADERS(locale.h)
  AC_CHECK_HEADERS(unistd.h)
  AC_CHECK_HEADERS(sys/time.h)
  AC_CHECK_HEADERS(sys/times.h, , AC_DEFINE(HAVE_NO_SYS_TIMES_H,1, [Set if <sys/times.h> is NOT available]))
  AC_CHECK_HEADERS(sys/resource.h, , AC_DEFINE(HAVE_NO_SYS_RESOURCE_WAIT_H,1, [Set if <sys/resource.h> is NOT available]))
  AC_CHECK_HEADERS(sys/types.h)
  AC_CHECK_HEADERS(signal.h)
  AC_CHECK_FUNCS(getpid, , AC_DEFINE(HAVE_NO_SIGNAL_H,1, [Set if getpid() function is NOT available]))
  AC_CHECK_FUNCS(getcwd, , AC_DEFINE(HAVE_NO_CWD,1, [Set if getcwd() function is NOT available]))
  AC_CHECK_FUNCS(getpwuid, , AC_DEFINE(HAVE_NO_HOME_DIRECTORY,1, [Set if getpwuid() function is NOT available]))
  AC_CHECK_FUNCS(system, , AC_DEFINE(HAVE_NO_SYSTEM, 1, [Set if system() function is NOT available]))
    
  ALL_LINGUAS="es fr el pt it en zh de"
  AM_GNU_GETTEXT
  AM_GNU_GETTEXT_VERSION([0.14.5])
  AC_CHECK_LIB(intl, main)
  
  AC_PROG_EGREP
  CONFIG_DOC_PROGS="yes"
  AC_PATH_PROG(LATEX, latex, "")
  if test -z "$LATEX"; then CONFIG_DOC_PROGS = "no"; fi
  
  if test "$CONFIG_DOC_PROGS" = "yes"; then
  	AC_PATH_PROG(MAKEINDEX, makeindex, "")
  	if test -z "$MAKEINDEX"; then CONFIG_DOC_PROGS = "no"; fi
  fi
  
  if test "$CONFIG_DOC_PROGS" = "yes"; then
  	AC_PATH_PROG(PDFLATEX, pdflatex, "")
  	if test -z "$PDFLATEX"; then CONFIG_DOC_PROGS = "no"; fi
  fi
  if test "$CONFIG_DOC_PROGS" = "yes"; then
  	AC_PATH_PROG(DVIPS, dvips, "")
  	if test -z "$DVIPS"; then CONFIG_DOC_PROGS = "no"; fi
  fi
  dnl if test "$CONFIG_DOC_PROGS" = "yes"; then
  dnl 	AC_PATH_PROG(LATEX2HTML, latex2html, "")
  dnl	if test -z "$LATEX2HTML"; then CONFIG_DOC_PROGS = "no"; fi
  dnl fi
  AC_SUBST(CONFIG_DOC_PROGS)
  AM_CONDITIONAL(DOC_PROGS, [test "$CONFIG_DOC_PROGS" = "yes"])
  
  dnl Checking for sstream for mathml
  AC_CHECK_HEADERS(sstream, AC_DEFINE(HAVE_SSTREAM,1), )
  
  dnl CXXFLAGS="$CXXFLAGS -fno-strict-aliasing -DSMARTPTR64"
  CXXFLAGS="$CXXFLAGS -fno-strict-aliasing -DGIAC_GENERIC_CONSTANTS"
  
  dnl Output makefiles etc.
  AC_OUTPUT([
  Makefile
  src/Makefile
  check/Makefile
  doc/Makefile
  doc/en/Makefile
  doc/es/Makefile
  doc/fr/Makefile
  doc/el/Makefile
  doc/el/tutoriel/Makefile
  doc/el/casinter/Makefile
  doc/local/Makefile
  doc/pt/Makefile
  doc/zh/Makefile
  doc/de/Makefile
  intl/Makefile
  po/Makefile.in
  examples/Makefile
  debianold/Makefile
  debian/Makefile
  ])
  
  echo "Adding link . to giac in src"
  rm -f src/giac && ln -s . src/giac
  rm -f src/config.h && cp config.h src
  rm -f path.h
  echo "#define giac_html_location \"$prefix/share/giac/doc/\"" >> path.h
  echo "#define giac_aide_location \"$prefix/share/giac/aide_cas\"" >> path.h
  echo "#ifdef __APPLE__" >> path.h
  echo "#define giac_locale_location \"/Applications/usr/share/locale/\"" >> path.h
  echo "#else" >> path.h
  echo "#define giac_locale_location \"$prefix/share/locale/\"" >> path.h
  echo "#endif" >> path.h
  echo "#define giac_gnuplot_location \"$GNUPLOT\"" >> path.h
  rm -f src/path.h && cp path.h src