dnl DBUS_PY_ADD_RST2HTMLFLAG(FLAG)
dnl checks whether rst2html supports the given flag, and if so, adds
dnl it to $RST2HTMLFLAGS. Same as JH_ADD_CFLAG, really.
AC_DEFUN([DBUS_PY_ADD_RST2HTMLFLAG],
[
AS_CASE([" $RST2HTMLFLAGS "],
[*@<:@\	\ @:>@$1@<:@\	\ @:>@*],
  [],
[*],
  [
  save_RST2HTMLFLAGS="$RST2HTMLFLAGS"
  RST2HTMLFLAGS="$RST2HTMLFLAGS $1"
  AC_MSG_CHECKING([whether [$]RST2HTML understands $1])
  AS_IF([$RST2HTML --strict $RST2HTMLFLAGS /dev/null > /dev/null 2>/dev/null],
    [dbuspy_has_option=yes],
    [dbuspy_has_option=no])
  AC_MSG_RESULT($dbuspy_has_option)
  AS_IF([test $dbuspy_has_option = no],
    [RST2HTMLFLAGS="$save_RST2HTMLFLAGS"])
  ])
])