+AC_ARG_ENABLE(xa51-port,[ --disable-xa51-port Excludes the XA51 port])
+echo xa51 >>ports.all
+if test "$enable_xa51_port" = "no"; then
+ AC_DEFINE_UNQUOTED(OPT_DISABLE_XA51, 1)
+else
+ echo xa51 >>ports.build
+ AC_DEFINE_UNQUOTED(OPT_DISABLE_XA51, 0)
+fi
+