onokazu reported that difference spec of class_exists between PHP4 and PHP5 triggers issue. To fix the issue, we need to give the 2nd parameter to class_exists(), but this work-around triggers another trouble on PHP4. Therefore, we will have to provide macro-like function like C macro to abstract the difference.
I have added XC_CLASS_EXIST function (macro) to the trunk, modified XCube_Root.class.php and let it start using the new function. Firstly, we have to modify all trunk files. After that, I'll merge the change of the trunk to other brances.
Rev 67 implemented this.