+ [BUILD_[]UP=xcb_defopt])
+dnl
+m4_if(xcb_defopt, [auto], [
+# This extension has a default value of "auto" and depends on the value of $2
+if test "x$BUILD_[]UP" = "xauto" ; then
+ BUILD_[]UP=$2
+fi
+if test "x$BUILD_[]UP" = "xyes" ; then
+ if test "x$2" = "xno" ; then
+ AC_MSG_ERROR([Extension []UP requested, but dependencies are not met])
+ fi
+fi])