AC_INIT(as31/as31.c)
AM_INIT_AUTOMAKE(as31, 2.3.1)

dnl ********************************************************************
dnl Minimal Requirements
dnl ********************************************************************

AC_PROG_CC
AC_PROG_YACC
AC_PROG_INSTALL

LIBS="$LIBS"
CFLAGS="$CFLAGS"
AC_SUBST(LIBS)
AC_SUBST(CFLAGS)

dnl ********************************************************************
dnl Options
dnl ********************************************************************

option_gtk=false
AC_MSG_CHECKING(for gtk)
AC_ARG_ENABLE(gtk,
  [  --enable-gtk            build as31 with graphical user interface (alpha)],
  gtk="$enableval", gtk="no")
case "$gtk" in
  yes)
    option_gtk=true
    AC_DEFINE(OPTION_GTK, 1)
    AC_MSG_RESULT(yes)
    ;;
  *)
    AC_DEFINE(OPTION_GTK, 0)
    AC_MSG_RESULT(no)
    ;;
esac

dnl ********************************************************************
dnl Check for Gtk GUI
dnl ********************************************************************

GUI_LIBS=""
GUI_CFLAGS=""
AC_SUBST(GUI_LIBS)
AC_SUBST(GUI_CFLAGS)

if test x$option_gtk = xtrue ; then
  have_gtk=false
  AM_PATH_GTK(1.0.1, have_gtk=true)
  if test x$have_gtk = xfalse ; then
    option_gtk=false
  else
    GUI_LIBS="$GTK_LIBS"
    GUI_CFLAGS="$GTK_CFLAGS"
  fi
fi

dnl ********************************************************************
dnl Conditional 
dnl ********************************************************************

AM_CONDITIONAL(OPTION_GTK, test x$option_gtk = xtrue)

dnl ********************************************************************
dnl Output
dnl ********************************************************************

AC_OUTPUT(Makefile as31/Makefile)