dnl MY_DEFINE(VARIABLE)
AC_DEFUN([MY_DEFINE],
[cat >> confdefs.h <<EOF
[#define] $1 1
EOF
])

dnl CONFIG_INTERFACE(package,macro_name,interface_id,help
dnl                  $1      $2         $3           $4
dnl                  action-if-yes-or-dynamic,
dnl		     $5
dnl		     action-if-yes,action-if-dynamic,action-if-no)
dnl		     $6            $7                $8
AC_DEFUN([CONFIG_INTERFACE],
[AC_ARG_ENABLE($1,[$4],
[case "x$enable_$1" in xyes|xdynamic) $5 ;; esac])
case "x$enable_$1" in
xyes)
  MY_DEFINE(IA_$2)
  AM_CONDITIONAL(ENABLE_$2, true)
  $6
  ;;
xdynamic)
  dynamic_targets="$dynamic_targets interface_$3.\$(so)"
  $7
  ;;
*)
  $8
  ;;
esac
AC_SUBST($3_so_libs)
])