ty Building with OTR support Generating a private key Starting a private conversation Authenticating a contact question and answer , shared secret , manual authentication Setting OTR policy global , account , contact OTR message logging User Interface options Off The Record (OTR) messaging is a form of secure messaging, it includes encryption, authentication between users, deniability and perfect forward secrecy. An overview and many useful resources can be found at the OTR site . If you have libotr-dev installed, support will be included by default. To force the build to fail if support cannot be included, configure with the following: ./configure --enable-otr Supported libotr versions are 3.2.x, and the latest release 4.0.0. On most distributions there is simply a libotr-dev package you need to install first. On Mac OS X, the brew forumla will automatica...