Hello,
The LMDB library is now tracked by the ABI tracker project: http://abi-laboratory.pro/tracker/timeline/lmdb/
One can look at the recent changes in the API/ABI and analysis of backward compatibility and navigate over the history of API/ABI changes in the library. The reports are generated daily by the abi-compliance-checker and abi-tracker tools: https://github.com/lvc/abi-tracker
Thank you.