装上EhLib3控件之后，DBSumLst单元报错
装上EhLib3控件之后，报如下错误：
Build
[Warning] DBSumLst.pas(89): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(252): Unsafe typecast of 'Integer' to 'TObject'
[Warning] DBSumLst.pas(431): Unsafe type 'Pointer'
[Warning] DBSumLst.pas(488): Unsafe type 'TBookmark'
[Error] DBSumLst.pas(501): Undeclared identifier: 'Null'
[Warning] DBSumLst.pas(513): Unsafe type 'ABookMark: Pointer'
[Warning] DBSumLst.pas(514): Unsafe type 'ABookMark: Pointer'
[Warning] DBSumLst.pas(515): Unsafe type 'Pointer'
[Error] DBSumLst.pas(556): Undeclared identifier: 'Null'
[Warning] DBSumLst.pas(576): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(576): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(584): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(584): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(591): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(591): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(593): Unsafe type 'Pointer'
[Warning] DBSumLst.pas(652): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(777): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(785): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(807): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(817): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(817): Unsafe type 'Bookmark: Pointer'
[Warning] DBSumLst.pas(824): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(824): Unsafe type 'Bookmark: Pointer'
[Warning] DBSumLst.pas(831): Unsafe type 'TBookmark'
[Warning] DBSumLst.pas(831): Unsafe type 'Bookmark: Pointer'
[Fatal Error] DBGridEh.pas(27): Could not compile used unit 'DBSumLst.pas'
不知道为何，请指教。
[解决办法]
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