2.8.0 is sufficiently high. (The answer is right there in the first
sentence of the policy help text.) ExternalProject was also introduced
in 2.8.0, so most projects using it should already be doing:
cmake_minimum_required(VERSION 2.8)
And if they do, then all policies that are in place as of that version
should be set to new by that line.
HTH,
D
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