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Require cmake 3 #571
#264 will need cmake3, and more generally it seems it's time to switch to version 3; that has been out for a long time now. Let's do a quick survey across our supported platform to see what they ship these days, and what minimum version of 3.x makes sense to require.
This page should have all the relevant availability/life-cycle info:
So based on an estimate of when Zeek 4.0 will come out (year from now), might aim to support whatever CMake version is on Ubuntu 16.04 LTS (probably will stay within 3.5.x) since Debian 8 should be on the way out by then. CentOS/RHEL will still have CMake 2.8.x as the default, but don't think we should wait on them since their support cycle is so long and do provide an easy way to get CMake 3.x (e.g. EPEL).