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####################################################################
#                                                                  #
#  The Why3 Verification Platform   /   The Why3 Development Team  #
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#  Copyright 2010-2016   --   INRIA - CNRS - Paris-Sud University  #
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#                                                                  #
#  This software is distributed under the terms of the GNU Lesser  #
#  General Public License version 2.1, with the special exception  #
#  on linking described in file LICENSE.                           #
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#                                                                  #
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####################################################################
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#
# autoconf input for Objective Caml programs
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# Copyright (C) 2001 Jean-Christophe Filliâtre
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#   from a first script by Georges Mariano
#
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# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License version 2, as published by the Free Software Foundation.
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#
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# This library 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.
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#
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# See the GNU Library General Public License version 2 for more details
# (enclosed in the file LGPL).

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AC_INIT([Why3], m4_esyscmd([. ./Version; echo -n "$VERSION"]))
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# verbosemake
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AC_ARG_ENABLE(verbose-make,
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    AS_HELP_STRING([--enable-verbose-make], [verbose makefile recipes]),,
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    enable_verbose_make=no)

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# LOCAL_CONF

AC_ARG_ENABLE(local,
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    AS_HELP_STRING([--enable-local], [use Why3 in the build directory (no installation)]),,
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    enable_local=no)
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# RELOCATABLE INSTALLATION

AC_ARG_ENABLE(relocation,
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    AS_HELP_STRING([--enable-relocation], [allow for later relocation of Why3 installation]),,
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    enable_relocation=no)

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# NATIVE

AC_ARG_ENABLE(native-code,
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    AS_HELP_STRING([--disable-native-code], [use only the byte-code compiler]),,
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    enable_native_code=yes)

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# Zarith

AC_ARG_ENABLE(zarith,
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    AS_HELP_STRING([--disable-zarith], [use Nums instead of Zarith for computations]),,
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    enable_zarith=yes)
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# camlzip
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AC_ARG_ENABLE(zip,
    AS_HELP_STRING([--enable-zip], [use LZ compression to store session files]),,
    enable_zip=yes)

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# menhirLib

AC_ARG_ENABLE(menhirLib,
    AS_HELP_STRING([--enable-menhirLib], [use MenhirLib parsing library]),,
    enable_menhirLib=yes)
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# IDE
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AC_ARG_ENABLE(ide,
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    AS_HELP_STRING([--disable-ide], [do not build Why3 IDE]),,
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    enable_ide=yes)

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# Coq tactic and libraries
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AC_ARG_ENABLE(coq-tactic,
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    AS_HELP_STRING([--disable-coq-tactic], [do not build Coq "why3" tactic]),,
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    enable_coq_tactic=yes)
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AC_ARG_ENABLE(coq-libs,
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    AS_HELP_STRING([--disable-coq-libs], [do not build Coq realizations]),,
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    enable_coq_libs=yes)
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# PVS libraries

AC_ARG_ENABLE(pvs-libs,
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    AS_HELP_STRING([--disable-pvs-libs], [do not build PVS realizations]),,
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    enable_pvs_libs=yes)

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# Isabelle libraries

AC_ARG_ENABLE(isabelle-libs,
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    AS_HELP_STRING([--disable-isabelle-libs], [do not build Isabelle realizations]),,
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    enable_isabelle_libs=yes)

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# hypothesis selection

AC_ARG_ENABLE(hypothesis-selection,
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    AS_HELP_STRING([--disable-hypothesis-selection], [do not support hypothesis selection]),,
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    enable_hypothesis_selection=yes)

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# documentation

AC_ARG_ENABLE(doc,
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    AS_HELP_STRING([--disable-doc], [do not build documentation]),,
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    enable_doc=yes)

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AC_ARG_ENABLE(html-doc,
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    AS_HELP_STRING([--disable-html-doc], [do not build HTML documentation]),,
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    enable_html_doc=yes)

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# Experimental Jessie3 Frama-C plugin, disabled by default
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AC_ARG_ENABLE(frama-c,
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    AS_HELP_STRING([--enable-frama-c], [enable Frama-C plugin]),,
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    [enable_frama_c=no
     reason_frama_c=" (disabled by default)"])
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# profiling
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AC_ARG_ENABLE(profiling,
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    AS_HELP_STRING([--enable-profiling], [enable profiling]),,
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    enable_profiling=no)
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# Emacs compilation

AC_ARG_ENABLE(emacs-compilation,
    AS_HELP_STRING([--disable-emacs-compilation], [do not compile why3.elc]),,
    enable_emacs_compilation=yes)

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# either relocation or local, not both
if test "$enable_relocation" = yes ; then
if test "$enable_local" = yes ; then
    AC_MSG_ERROR(cannot use --enable-relocation and --enable-local at the same time.)
fi
fi

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# Check for arch/OS

AC_MSG_CHECKING(executable suffix)
if uname -s | grep -q CYGWIN ; then
  EXE=.exe
  STRIP='echo "no strip "'
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  AC_MSG_RESULT(.exe <Cygwin>)
else
if uname -s | grep -q MINGW ; then
  EXE=.exe
  STRIP=strip
  AC_MSG_RESULT(.exe <MinGW>)
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else
  EXE=
  STRIP=strip
  AC_MSG_RESULT(<none>)
fi
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fi

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AC_PROG_CC
AC_PROG_MKDIR_P
AC_PROG_INSTALL
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# Check for Ocaml compilers

# we first look for ocamlc in the path; if not present, we fail
AC_CHECK_PROG(OCAMLC,ocamlc,ocamlc,no)
if test "$OCAMLC" = no ; then
	AC_MSG_ERROR(Cannot find ocamlc.)
fi

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# we extract Ocaml version number
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OCAMLVERSION=`$OCAMLC -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
echo "ocaml version is $OCAMLVERSION"

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case "$OCAMLVERSION" in
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  0.*|1.*|2.*|3.*|4.00.*)
        AC_MSG_ERROR(You need Objective Caml 4.01.0 or higher);;
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esac

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# Ocaml library path
# old way: OCAMLLIB=`$OCAMLC -v | tail -1 | cut -f 4 -d ' ' | tr -d '\\r'`
OCAMLLIB=`$OCAMLC -where | tr -d '\\r'`
echo "ocaml library path is $OCAMLLIB"

# then we look for ocamlopt; if not present, we issue a warning
# if the version is not the same, we also discard it
# we set OCAMLBEST to "opt" or "byte", whether ocamlopt is available or not
AC_CHECK_PROG(OCAMLOPT,ocamlopt,ocamlopt,no)
OCAMLBEST=byte
if test "$OCAMLOPT" = no ; then
	AC_MSG_WARN(Cannot find ocamlopt; bytecode compilation only.)
else
	AC_MSG_CHECKING(ocamlopt version)
	TMPVERSION=`$OCAMLOPT -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
	if test "$TMPVERSION" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(differs from ocamlc; ocamlopt discarded.)
	    OCAMLOPT=no
	else
	    AC_MSG_RESULT(ok)
	    OCAMLBEST=opt
	fi
fi

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# checking for native-code
if test "$enable_native_code" != yes || test "$OCAMLBEST" = byte ; then
    enable_native_code=no
    OCAMLBEST=byte
    OCAMLOPT=no
fi

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# checking for ocamlc.opt
AC_CHECK_PROG(OCAMLCDOTOPT,ocamlc.opt,ocamlc.opt,no)
if test "$OCAMLCDOTOPT" != no ; then
	AC_MSG_CHECKING(ocamlc.opt version)
	TMPVERSION=`$OCAMLCDOTOPT -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
	if test "$TMPVERSION" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(differs from ocamlc; ocamlc.opt discarded.)
	else
	    AC_MSG_RESULT(ok)
	    OCAMLC=$OCAMLCDOTOPT
	fi
fi

# checking for ocamlopt.opt
if test "$OCAMLOPT" != no ; then
    AC_CHECK_PROG(OCAMLOPTDOTOPT,ocamlopt.opt,ocamlopt.opt,no)
    if test "$OCAMLOPTDOTOPT" != no ; then
	AC_MSG_CHECKING(ocamlc.opt version)
	TMPVER=`$OCAMLOPTDOTOPT -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
	if test "$TMPVER" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(differs from ocamlc; ocamlopt.opt discarded.)
	else
	    AC_MSG_RESULT(ok)
	    OCAMLOPT=$OCAMLOPTDOTOPT
	fi
    fi
fi

# ocamldep, ocamllex and ocamlyacc should also be present in the path
AC_CHECK_PROG(OCAMLDEP,ocamldep,ocamldep,no)
if test "$OCAMLDEP" = no ; then
   AC_MSG_ERROR(Cannot find ocamldep.)
else
   AC_CHECK_PROG(OCAMLDEPDOTOPT,ocamldep.opt,ocamldep.opt,no)
   if test "$OCAMLDEPDOTOPT" != no ; then
      OCAMLDEP=$OCAMLDEPDOTOPT
   fi
fi

AC_CHECK_PROG(OCAMLLEX,ocamllex,ocamllex,no)
if test "$OCAMLLEX" = no ; then
	AC_MSG_ERROR(Cannot find ocamllex.)
else
    AC_CHECK_PROG(OCAMLLEXDOTOPT,ocamllex.opt,ocamllex.opt,no)
    if test "$OCAMLLEXDOTOPT" != no ; then
	OCAMLLEX=$OCAMLLEXDOTOPT
    fi
fi

AC_CHECK_PROG(OCAMLYACC,ocamlyacc,ocamlyacc,no)
if test "$OCAMLYACC" = no ; then
	AC_MSG_ERROR(Cannot find ocamlyacc.)
fi

AC_CHECK_PROG(OCAMLDOC,ocamldoc,ocamldoc,true)
if test "$OCAMLDOC" = true ; then
    AC_MSG_WARN(Cannot find ocamldoc)
else
    AC_CHECK_PROG(OCAMLDOCOPT,ocamldoc.opt,ocamldoc.opt,no)
    if test "$OCAMLDOCOPT" != no ; then
	OCAMLDOC=$OCAMLDOCOPT
    fi
fi

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AC_CHECK_PROG(MENHIR,menhir,menhir,no)
if test "$MENHIR" = no ; then
	AC_MSG_ERROR(Cannot find menhir.)
fi

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## Where are the library we need
# we look for ocamlfind; if not present, we just don't use it to find
# libraries
AC_CHECK_PROG(USEOCAMLFIND,ocamlfind,yes,no)

if test "$USEOCAMLFIND" = yes; then
   OCAMLFINDLIB=$(ocamlfind printconf stdlib)
   OCAMLFIND=$(which ocamlfind)
   if test "$OCAMLFINDLIB" != "$OCAMLLIB"; then
   USEOCAMLFIND=no;
   echo "but your ocamlfind is not compatible with your ocamlc:"
   echo "ocamlfind : $OCAMLFINDLIB, ocamlc : $OCAMLLIB"
   fi
fi

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if test "$enable_local" = no; then
   LOCALDIR=''
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else
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   LOCALDIR="${PWD}"
fi

if test "$enable_local" = yes ; then
   OCAMLINSTALLLIB=$LOCALDIR/lib
else
   #if ocamlfind is used it gives the install path for ocaml library
   if test "$USEOCAMLFIND" = yes; then
      OCAMLINSTALLLIB=$(ocamlfind printconf destdir)
   else
      OCAMLINSTALLLIB=$OCAMLLIB
   fi
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fi

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# bin-annot
case "$OCAMLVERSION" in
  0.*|1.*|2.*|3.*)
        enable_bin_annot=no;;
  *)
        enable_bin_annot=yes;;
esac
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# checking for rubber
if test "$enable_doc" = yes ; then
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   AC_CHECK_PROG(RUBBER,rubber,rubber,no)
   if test "$RUBBER" = no ; then
      enable_doc=no
      enable_html_doc=no
      reason_doc=" (rubber not found)"
      AC_MSG_WARN([Cannot find rubber, documentation disabled.])
   fi
else
   enable_html_doc=no
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fi

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# checking for hevea (note that the pdf documentation DOES NOT use hevea.sty)
if test "$enable_html_doc" = yes ; then
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   AC_CHECK_PROG(HEVEA,hevea,hevea,no)
   if test "$HEVEA" = no ; then
      enable_html_doc=no
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      reason_html_doc=" (hevea not found)"
      AC_MSG_WARN([Cannot find hevea, HTML documentation disabled.])
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   fi
fi
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# checking for hacha
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if test "$enable_html_doc" = yes ; then
   AC_CHECK_PROG(HACHA,hacha,hacha,no)
   if test "$HACHA" = no ; then
      enable_html_doc=no
      reason_html_doc=" (hacha not found)"
      AC_MSG_WARN([Cannot find hacha, HTML documentation disabled.])
   fi
fi
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# checking for emacs
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if test "$enable_emacs_compilation" = yes ; then
   AC_CHECK_PROG(EMACS,emacs,emacs,no)
   if test "$EMACS" = no ; then
      enable_emacs_compilation=no
      AC_MSG_WARN([Cannot find emacs, compilation of why3.elc disabled.])
   fi
fi
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# checking for Zarith
if test "$enable_zarith" = yes; then
   if test "$USEOCAMLFIND" = yes; then
      BIGINTINCLUDE=$(ocamlfind query zarith)
   fi
   if test -n "$BIGINTINCLUDE"; then
      echo "ocamlfind found zarith in $BIGINTINCLUDE"
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      BIGINTINCLUDE="-I $BIGINTINCLUDE"
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   else
      AC_CHECK_FILE($OCAMLLIB/zarith/zarith.cma,,enable_zarith=no)
      if test "$enable_zarith" = no; then
         AC_MSG_WARN([Lib Zarith not found, using Nums instead.])
         reason_zarith=" (zarith not found)"
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      else
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         BIGINTINCLUDE="-I +zarith"
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      fi
   fi
fi

if test "$enable_zarith" = yes; then
   BIGINTLIB=zarith
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   BIGINTPKG=zarith
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else
   BIGINTLIB=nums
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   BIGINTPKG=num
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fi

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# checking for camlzip
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if test "$enable_zip" = yes; then
   if test "$USEOCAMLFIND" = yes; then
      ZIPINCLUDE=$(ocamlfind query zip)
   fi
   if test -n "$ZIPINCLUDE"; then
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      echo "ocamlfind found camlzip in $ZIPINCLUDE"
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      ZIPINCLUDE="-I $ZIPINCLUDE"
   else
      AC_CHECK_FILE($OCAMLLIB/zip/zip.cma,,enable_zip=no)
      if test "$enable_zip" = no; then
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         AC_MSG_WARN([Lib camlzip not found, sessions files will not be compressed.])
         reason_zip=" (camlzip not found)"
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      else
         ZIPINCLUDE="-I +zip"
      fi
   fi
fi

if test "$enable_zip" = yes; then
   ZIPLIB=zip
else
   ZIPLIB=
fi

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if test "$enable_menhirLib" = yes; then
  if test "$USEOCAMLFIND" = yes; then
     MENHIRINCLUDE=$(ocamlfind query menhirLib)
  fi
  if test -n "$MENHIRINCLUDE"; then
     echo "ocamlfind found menhirLib in $MENHIRINCLUDE"
     MENHIRINCLUDE="-I $MENHIRINCLUDE"
  else
     AC_CHECK_FILE($OCAMLLIB/menhirLib/menhirLib.cmx,,enable_menhirLib=no)
     if test "$enable_menhirLib" = no; then
        AC_MSG_WARN([Lib menhirLib not found, parser source files will be bigger.])
        reason_menhirLib=" (menhirLib not found)"
     else
        MENHIRINCLUDE="-I +menhirLib"
     fi
   fi
fi

if test "$enable_menhirLib" = yes; then
   MENHIRLIB=menhirLib
else
   MENHIRLIB=
fi

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# checking for lablgtk2
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if test "$enable_ide" = yes ; then
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   if test "$USEOCAMLFIND" = yes; then
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      LABLGTK2LIB=$(ocamlfind query lablgtk2)
   fi
   if test -n "$LABLGTK2LIB";then
      echo "ocamlfind found lablgtk2 in $LABLGTK2LIB"
   else
      LABLGTK2LIB="+lablgtk2"
      AC_CHECK_FILE($OCAMLLIB/lablgtk2/lablgtk.cma,,enable_ide=no)
      if test "$enable_ide" = no; then
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         AC_MSG_WARN([Lib lablgtk2 not found, IDE disabled.])
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         reason_ide=" (lablgtk2 not found)"
      fi
   fi
fi

# checking for lablgtksourceview2
if test "$enable_ide" = yes ; then
   if test "$USEOCAMLFIND" = yes; then
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      LABLGTKSV2LIB=$(ocamlfind query lablgtk2.sourceview2)
      if test -z "$LABLGTKSV2LIB"; then
         LABLGTKSV2LIB=$(ocamlfind query lablgtksourceview2)
      fi
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   fi
   if test -n "$LABLGTKSV2LIB";then
      echo "ocamlfind found lablgtksourceview2 in $LABLGTKSV2LIB"
   else
      AC_CHECK_FILE($OCAMLLIB/lablgtk2/lablgtksourceview2.cma,,enable_ide=no)
      if test "$enable_ide" = no; then
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         AC_MSG_WARN([Lib lablgtksourceview2 not found, IDE disabled.])
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         reason_ide=" (lablgtksourceview2 not found)"
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      fi
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   fi
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fi
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if test "$enable_ide" = yes ; then
  LABLGTK2PKG="lablgtk2 lablgtk2.init lablgtk2.sourceview2"
else
  LABLGTK2PKG=
fi

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dnl AC_CHECK_PROG(enable_ide,lablgtk2,yes,no) not always available (Win32)
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dnl AC_CHECK_PROG(OCAMLWEB,ocamlweb,ocamlweb,true)
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# Coq
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enable_coq_support=yes
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enable_coq_fp_libs=yes

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coq_compat_version=

if test "$enable_coq_tactic" = no -a "$enable_coq_libs" = no; then
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   enable_coq_support=no
   AC_MSG_WARN(coq support disabled)
   reason_coq_support=" (disabled by user)"
fi

if test "$enable_coq_support" = yes; then
   AC_CHECK_PROG(COQC,coqc,coqc,no)
   if test "$COQC" = no ; then
      enable_coq_support=no
      AC_MSG_WARN(Cannot find coqc.)
      reason_coq_support=" (coqc not found)"
   fi
fi

if test "$enable_coq_support" = yes; then
   COQLIB=`$COQC -where | sed -e 's|\\\|/|g' -e 's| |\\ |g'`
   AC_MSG_CHECKING(Coq version)
   COQVERSION=`$COQC -v | sed -n -e 's|.*version* *\([[^ ]]*\) .*$|\1|p' `

   #Even if the name of the variable is CAMLP4 the value can be camlp5
   CAMLP4BIN=`coqtop -config | sed -n -e 's/CAMLP4BIN=\(.*\)$/\1/p'`
   CAMLP4=`coqtop -config | sed -n -e 's/CAMLP4=\(.*\)$/\1/p'`
   COQCAMLPLIB=`coqtop -config | sed -n -e 's/CAMLP4LIB=\(.*\)$/\1/p'`

   case $COQVERSION in
      8.4*)
         coq_compat_version="COQ84"
         COQPPLIBS="$COQLIB/parsing/grammar.cma"
         AC_MSG_RESULT($COQVERSION)
         ;;
      8.5*|trunk)
         coq_compat_version="COQ85"
         COQPPLIBS="$OCAMLLIB/unix.cma $OCAMLLIB/threads/threads.cma $COQLIB/grammar/grammar.cma"
         AC_MSG_RESULT($COQVERSION)
         ;;
      *)
         enable_coq_support=no
         AC_MSG_WARN(You need Coq 8.4 or later; Coq discarded)
         reason_coq_support=" (version is $COQVERSION but need version 8.4 or later)"
         ;;
   esac
fi

if test "$enable_coq_support" = yes; then
   AC_CHECK_PROG(COQDEP,coqdep,coqdep,no)
   if test "$COQDEP" = no; then
      enable_coq_support=no
      AC_MSG_WARN(Cannot find coqdep.)
      reason_coq_support=" (coqdep not found)"
   fi
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fi
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if test "$enable_coq_support" = no; then
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   enable_coq_tactic=no
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   enable_coq_libs=no
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   COMPILETIMECOQ=
else
   COMPILETIMECOQ="\\\"Coq\\\", \\\"$COQVERSION\\\"; "
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fi

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if test "$enable_coq_tactic" = yes; then
   AC_CHECK_FILE($COQLIB/kernel/term.cmi,,enable_coq_tactic=no)
   if test "$enable_coq_tactic" = no; then
      reason_coq_tactic=" ($COQLIB/kernel/term.cmi not found)"
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   fi
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fi
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if test "$enable_coq_tactic" = yes; then
   AC_PATH_PROG(COQCAMLP,${CAMLP4}o,no,$CAMLP4BIN)
   if test "$COQCAMLP" = no; then
      enable_coq_tactic=no
      AC_MSG_WARN(Cannot find camlpXo.)
      reason_coq_tactic=" (camlpXo not found)"
   fi
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fi
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if test "$enable_coq_libs" = yes; then
   AC_MSG_CHECKING([for Flocq])
   AS_IF(
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     [ echo "Require Import Flocq.Flocq_version BinNat." \
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            "Goal (20500 <= Flocq_version)%N. easy. Qed." > conftest.v
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       "$COQC" conftest.v > conftest.err ],
     [ AC_MSG_RESULT(yes) ],
     [ AC_MSG_RESULT(no)
       enable_coq_fp_libs=no
       AC_MSG_WARN(Cannot find Flocq.)
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       reason_coq_fp_libs=" (Flocq >= 2.5 not found)" ])
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   rm -f conftest.v conftest.vo conftest.err
fi

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# PVS

if test "$enable_pvs_libs" = no; then
    enable_pvs_support=no
    AC_MSG_WARN(PVS support disabled)
    reason_pvs_support=" (disabled by user)"
else
    AC_CHECK_PROG(PVS,pvs,pvs,no)
    if test "$PVS" = no ; then
        enable_pvs_support=no
        AC_MSG_WARN(Cannot find pvs.)
        reason_pvs_support=" (pvs not found)"
    else
        PVSLIB=`$PVS -where`
        AC_MSG_CHECKING(PVS version)
        PVSVERSION=`$PVS -version | sed -n -e 's|.*Version* *\([[^ ]]*\)$|\1|p' `

        case $PVSVERSION in
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          6.*)
	        enable_pvs_support=yes
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                AC_MSG_RESULT($PVSVERSION)
                ;;
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          *)
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                AC_MSG_RESULT($PVSVERSION)
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                enable_pvs_support=no
	        AC_MSG_WARN(You need PVS 6.0 or higher; PVS discarded)
                reason_pvs_support=" (need version 6.0 or higher)"
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                ;;
        esac
    fi
fi

if test "$enable_pvs_support" = no; then
   enable_pvs_libs=no
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   COMPILETIMEPVS=
else
   COMPILETIMEPVS="\\\"PVS\\\", \\\"$PVSVERSION\\\"; "
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fi

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# Isabelle

if test "$enable_isabelle_libs" = no; then
    enable_isabelle_support=no
    AC_MSG_WARN(Isabelle support disabled)
    reason_isabelle_support=" (disabled by user)"
else
    AC_CHECK_PROG(ISABELLE,isabelle,isabelle,no)
    if test "$ISABELLE" = no ; then
        enable_isabelle_support=no
        AC_MSG_WARN(Cannot find isabelle.)
        reason_isabelle_support=" (isabelle not found)"
    else
        AC_MSG_CHECKING(Isabelle version)
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        ISABELLEDETECTEDVERSION=`$ISABELLE version | sed -n -e 's|Isabelle\([[^:]]*\).*$|\1|p' `
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        case $ISABELLEDETECTEDVERSION in
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          2015*)
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	        enable_isabelle_support=yes
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                ISABELLEVERSION=2015
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                AC_MSG_RESULT($ISABELLEDETECTEDVERSION)
                ;;
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          2016*)
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	        enable_isabelle_support=yes
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                ISABELLEVERSION=2016
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                AC_MSG_RESULT($ISABELLEDETECTEDVERSION)
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                ;;
          *)
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                AC_MSG_RESULT($ISABELLEDETECTEDVERSION)
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                enable_isabelle_support=no
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	        AC_MSG_WARN(You need Isabelle 2015 or later; Isabelle discarded)
                reason_isabelle_support=" (need version >= 2015)"
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                ;;
        esac
    fi
fi

if test "$enable_isabelle_support" = no; then
   enable_isabelle_libs=no
fi

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if test "$enable_pvs_libs" = yes; then
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   AC_MSG_CHECKING([for NASA PVS library])
   enable_pvs_libs=no
   reason_pvs_libs=" (no NASA PVS library in PVS_LIBRARY_PATH)"
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   for dir in  `echo $PVS_LIBRARY_PATH | tr ':' ' '`; do
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       if test -f $dir/nasalib-version; then
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          enable_pvs_libs=yes
          reason_pvs_libs=""
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       fi
   done
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   AC_MSG_RESULT($enable_pvs_libs)
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fi

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# hypothesis_selection
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if test "$enable_hypothesis_selection" = yes; then
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   if test "$USEOCAMLFIND" = yes; then
     OCAMLGRAPHLIB=$(ocamlfind query ocamlgraph)
   fi
   if test -n "$OCAMLGRAPHLIB"; then
     echo "ocamlfind found ocamlgraph in $OCAMLGRAPHLIB"
   else
     OCAMLGRAPHLIB="+ocamlgraph"
     AC_CHECK_FILE($OCAMLLIB/ocamlgraph/,,enable_hypothesis_selection=no)
     if test "$enable_hypothesis_selection" = no; then
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       reason_hypothesis_selection=" (ocamlgraph not found)"
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       AC_MSG_WARN([Lib ocamlgraph not found, hypothesis selection disabled.])
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     fi
   fi
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fi
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#check frama-c
if test "$enable_frama_c" = yes ; then
   AC_CHECK_PROG(FRAMAC,frama-c,frama-c,no)
   if test "$FRAMAC" = no ; then
        AC_MSG_WARN(Cannot find Frama-C.)
        enable_frama_c="no"
        reason_frama_c=" (frama-c not found)"
   else
      AC_MSG_CHECKING(Frama-C version)
      FRAMAC_VERSION=`$FRAMAC -version | sed -n -e 's|Version: *\(.*\)$|\1|p'`
      AC_MSG_RESULT($FRAMAC_VERSION)
      case $FRAMAC_VERSION in
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         Sodium-*) ;;
         *) AC_MSG_WARN(Version Sodium required.)
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            enable_frama_c=no
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            reason_frama_c=" (version Sodium required)"
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            ;;
      esac
      FRAMAC_SHARE=`$FRAMAC -print-path`
      FRAMAC_LIBDIR=`$FRAMAC -print-libpath`
   fi
fi

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#For the META
if test "$enable_hypothesis_selection" = yes; then
   META_OCAMLGRAPH="ocamlgraph"
else
   META_OCAMLGRAPH=""
fi

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#Viewer for ps and pdf
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dnl AC_CHECK_PROGS(PSVIEWER,gv evince)
dnl AC_CHECK_PROGS(PDFVIEWER,xpdf acroread evince)

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VERSION=$PACKAGE_VERSION
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# substitutions to perform
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AC_SUBST(VERSION)

AC_SUBST(enable_verbose_make)

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AC_SUBST(EXE)
AC_SUBST(STRIP)

AC_SUBST(OCAMLC)
AC_SUBST(OCAMLOPT)
AC_SUBST(OCAMLDEP)
AC_SUBST(OCAMLLEX)
AC_SUBST(OCAMLYACC)
AC_SUBST(OCAMLDOC)
AC_SUBST(OCAMLBEST)
AC_SUBST(OCAMLVERSION)
AC_SUBST(OCAMLLIB)
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AC_SUBST(OCAMLINSTALLLIB)
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dnl AC_SUBST(OCAMLV)
dnl AC_SUBST(FORPACK)
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AC_SUBST(OCAMLGRAPHLIB)
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dnl AC_SUBST(OCAMLWEB)
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AC_SUBST(MENHIR)
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AC_SUBST(enable_profiling)
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AC_SUBST(enable_bin_annot)
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AC_SUBST(COQCAMLP)
AC_SUBST(COQCAMLPLIB)
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AC_SUBST(enable_ide)
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AC_SUBST(LABLGTK2LIB)
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AC_SUBST(LABLGTK2PKG)

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AC_SUBST(META_OCAMLGRAPH)
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AC_SUBST(enable_zarith)
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AC_SUBST(BIGINTINCLUDE)
AC_SUBST(BIGINTLIB)
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AC_SUBST(BIGINTPKG)
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AC_SUBST(enable_zip)
AC_SUBST(ZIPINCLUDE)
AC_SUBST(ZIPLIB)

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AC_SUBST(enable_menhirLib)
AC_SUBST(MENHIRINCLUDE)
AC_SUBST(MENHIRLIB)

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AC_SUBST(enable_coq_tactic)
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AC_SUBST(enable_coq_libs)
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AC_SUBST(enable_coq_support)
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AC_SUBST(enable_coq_fp_libs)
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AC_SUBST(coq_compat_version)
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AC_SUBST(COQC)
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AC_SUBST(COQDEP)
AC_SUBST(COQLIB)
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AC_SUBST(COQPPLIBS)
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AC_SUBST(COMPILETIMECOQ)
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AC_SUBST(enable_pvs_libs)
AC_SUBST(PVS)
AC_SUBST(PVSVERSION)
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AC_SUBST(COMPILETIMEPVS)
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AC_SUBST(enable_isabelle_libs)
AC_SUBST(ISABELLE)
AC_SUBST(ISABELLEVERSION)

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AC_SUBST(enable_hypothesis_selection)

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AC_SUBST(enable_doc)
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AC_SUBST(enable_html_doc)

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AC_SUBST(RUBBER)
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AC_SUBST(HEVEA)
AC_SUBST(HACHA)
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AC_SUBST(enable_emacs_compilation)
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AC_SUBST(EMACS)
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AC_SUBST(enable_frama_c)

AC_SUBST(FRAMAC)
AC_SUBST(FRAMAC_VERSION)
AC_SUBST(FRAMAC_SHARE)
AC_SUBST(FRAMAC_LIBDIR)

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AC_SUBST(enable_local)
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AC_SUBST(LOCALDIR)

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AC_SUBST(enable_relocation)

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dnl AC_SUBST(PSVIEWER)
dnl AC_SUBST(PDFVIEWER)
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# Finally create the Makefile from Makefile.in
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AC_CONFIG_FILES(Makefile src/config.sh doc/version.tex)
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AC_CONFIG_FILES(lib/why3/META)
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AC_CONFIG_FILES(.merlin)
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AC_CONFIG_FILES(src/jessie/Makefile)
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AC_CONFIG_COMMANDS([chmod],
chmod a-w Makefile src/config.sh doc/version.tex;
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chmod a-w lib/why3/META;
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chmod a-w .merlin;
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chmod a-w src/jessie/Makefile;
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chmod u+x src/config.sh)

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AC_OUTPUT
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# Summary

echo
echo "                 Summary"
echo "-----------------------------------------"
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echo "Verbose make                : $enable_verbose_make"
echo "OCaml compiler              : yes"
echo "    Version                 : $OCAMLVERSION"
echo "    Library path            : $OCAMLLIB"
echo "    Native compilation      : $enable_native_code"
echo "    Profiling               : $enable_profiling"
echo "Components"
echo "    IDE command             : $enable_ide$reason_ide"
echo "    GMP arithmetic          : $enable_zarith$reason_zarith"
echo "    Compressed sessions     : $enable_zip$reason_zip"
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echo "    MenhirLib support       : $enable_menhirLib$reason_menhirLib"
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echo "    Hypothesis selection    : $enable_hypothesis_selection$reason_hypothesis_selection"
echo "    Frama-C support         : $enable_frama_c$reason_frama_c"
if test "$enable_frama_c" = yes ; then
   echo "        Version             : $FRAMAC_VERSION"
   echo "        Share path          : $FRAMAC_SHARE"
   echo "        Library path        : $FRAMAC_LIBDIR"
fi
echo "Documentation               : $enable_doc$reason_doc"
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if test "$enable_doc" = yes ; then
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   echo "    PDF                     : yes"
   echo "    HTML                    : $enable_html_doc$reason_html_doc"
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fi
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echo "Support for interactive proof assistants"
echo "    Coq                     : $enable_coq_support$reason_coq_support"
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if test "$enable_coq_support" = yes ; then
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   echo "        Version             : $COQVERSION"
   echo "        Library path        : $COQLIB"
   echo "        \"why3\" tactic       : $enable_coq_tactic$reason_coq_tactic"
   echo "        Realization support : $enable_coq_libs$reason_coq_libs"
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   if test "$enable_coq_libs" = yes ; then
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      echo "            FP arithmetic   : $enable_coq_fp_libs$reason_coq_fp_libs"
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   fi
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fi
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echo "    PVS                     : $enable_pvs_support$reason_pvs_support"
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if test "$enable_pvs_support" = yes ; then
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   echo "        Version             : $PVSVERSION"
   echo "        Library path        : $PVSLIB"
   echo "        Realization support : $enable_pvs_libs$reason_pvs_libs"
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fi
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echo "    Isabelle                : $enable_isabelle_support$reason_isabelle_support"
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if test "$enable_isabelle_support" = yes ; then
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   echo "        Version             : $ISABELLEVERSION ($ISABELLEDETECTEDVERSION)"
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   echo "        Realization support : $enable_isabelle_libs$reason_isabelle_libs"
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fi
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if test "$enable_local" = yes ; then
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   echo "Installable                 : no"
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else
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   echo "Installable                 : yes"
   echo "    Binary path             : $bindir"
   echo "    Lib path                : $libdir/why3"
   echo "    Data path               : $datarootdir/why3"
   echo "    Ocaml Library           : $OCAMLINSTALLLIB/why3"
   echo "    Relocatable             : $enable_relocation"
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fi