In fact, I've done just that. This machine is now running 1.6 and I've verified that UIDL returns the same UIDL as the other 1.6 clients. All three machines return the same UIDL. What do I have to do to upgrade to 2.1 and make it return the same UIDLs as the 1.6 clients? It appears to me that make install-strip, make install-configure doesn't do it as that's exactly what I did before.
A normal upgrade should do that. If this is not happening for you, there must be something else that's going on.
Make sure that you are indeed upgrading to 2.1, not 2.0. 2.0.x will not work.
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