[Boost-users] [Serialization] 1.49 to 1.55 problems

I did search for "serialization incompatible version" on Google and found issues regarding certain older versions. I checked the release notes as far back as were on the web site, and didn't see anything. I tried building a program with Boost 1.55, and found it would not interoperate with existing programs that were built with Boost 1.49. Taking the error at face value, I need to configure the code to write the old version. How would I do that? —John