I had some trouble locating all the packages. I was missing libjansson and libevent_core.
Is my repository out of date?
jansson and libevent are both still needed.
This is what I have installed on Ubuntu:
ii libevent-2.0-5:amd64 2.0.21-stable-1ubuntu1.14.04.1 amd64 Asynchronous event notification library
ii libevent-core-2.0-5:amd64 2.0.21-stable-1ubuntu1.14.04.1 amd64 Asynchronous event notification library (core)
ii libevent-dev 2.0.21-stable-1ubuntu1.14.04.1 amd64 Asynchronous event notification library (development files)
ii libevent-extra-2.0-5:amd64 2.0.21-stable-1ubuntu1.14.04.1 amd64 Asynchronous event notification library (extra)
ii libevent-openssl-2.0-5:amd64 2.0.21-stable-1ubuntu1.14.04.1 amd64 Asynchronous event notification library (openssl)
ii libevent-pthreads-2.0-5:amd64 2.0.21-stable-1ubuntu1.14.04.1 amd64 Asynchronous event notification library (pthreads)
ii libjansson-dev:amd64 2.5-2 amd64 C library for encoding, decoding and manipulating JSON data (dev)
ii libjansson4:amd64 2.5-2 amd64 C library for encoding, decoding and manipulating JSON data
Not sure what's the process for OSX - macports?