Newer CMake is going to drop <2.8.12
So update to 2.8.12.2 (in Ubuntu 14.04)
CentOS 7 has a way to install CMake3.
This avoids the warning in newer CMakes:
flatcc/CMakeLists.txt:5 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.
# Ubuntu 14.04 (Trusty)
-#cmake_minimum_required (VERSION 2.8.12.2)
+cmake_minimum_required (VERSION 2.8.12.2)
# Centos 7
#cmake_minimum_required (VERSION 2.8.11)
-cmake_minimum_required (VERSION 2.8)
+#cmake_minimum_required (VERSION 2.8)
# Experimental for generating compile_commands.json so editors with
# clangd language server support can use it. Symlink
