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+ o Major features
+ - Tor can now optionally build with the "bufferevents" buffered IO
+ backend provided by Libevent, when building with Libevent 2.0.7-rc
+ or later. To use this feature, make sure you have the latest possible
+ version of Libevent, and run autoconf with the --enable-bufferevents
+ flag. Using this feature will make our networking code more flexible,
+ lets us stack layers on each other, and let us use more efficient
+ zero-copy transports where available.
+