- AS_HELP_STRING([--with-windows2000], [compile with support for Windows 2000. This disables support for tunneling over existing IPv6 networks.]),
- [AC_DEFINE(WITH_WINDOWS2000, 1, [Compile with support for Windows 2000])]
+ AS_HELP_STRING([--without-windows2000], [compile with support for Windows 2000. This disables support for tunneling over existing IPv6 networks.]),
+ [ AS_IF([test "x$with_windows2000" = "xyes"],
+ [AC_DEFINE(WITH_WINDOWS2000, 1, [Compile with support for Windows 2000])])
+ ]