add external jar file as part of a system library

FWIW, it appears that if you add the external jar file as part of a user library, specify that the user library is a system library, and add the user library to the Java Build Path then it will work.


For completeness to do this you can do the following:
1. Right-click the project in Eclipse and select "Build Path -> Add Libraries...".
2. Select User Library from the list and click Next.
3. Click the "User Libraries..." button.
4. Click "New..." in the User Libraries dialog.
5. Give the user library a name and select the System library checkbox and click OK.
6. Highlight the newly added user library in the list and click the "Add JARs..." button and add the desired jar files.
7. Click OK on the User Libraries dialog.
8. Make sure the new user library is checked in the Add Library dialog and click Finish.