CMake Warning \(dev\) at subdir2/CMakeLists.txt:2 \(include\):
  Policy CMP0024 is not set: Disallow include export result.  Run "cmake
  --help-policy CMP0024" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  The file

    .*/Tests/RunCMake/include/CMP0024-WARN-build/subdir1/theTargets.cmake

  was generated by the export\(\) command.  It should not be used as the
  argument to the include\(\) command.  Use ALIAS targets instead to refer to
  targets by alternative names.

This warning is for project developers.  Use -Wno-dev to suppress it.