CMake Warning \(dev\) in CMakeLists\.txt:
  Policy CMP0128 is not set: Selection of language standard and extension
  flags improved\.  Run "cmake --help-policy CMP0128" for policy details\.  Use
  the cmake_policy command to set the policy and suppress this warning\.

  For compatibility with older versions of CMake, compiler extensions won't
  be @opposite@\.
This warning is for project developers\.  Use -Wno-dev to suppress it\.