# CMP0014

Warning

The `OLD` behavior of this policy was removed in CMake version 4.0. This policy must be set to `NEW` by a call to `cmake_minimum_required()` or `cmake_policy()`.

Input directories must have `CMakeLists.txt`.

CMake versions before 2.8 silently ignored missing `CMakeLists.txt` files in directories referenced by `add_subdirectory()` or `subdirs()`, treating them as if present but empty. In CMake 2.8.0 and above this `cmake_policy()` determines whether or not the case is an error. The `OLD` behavior for this policy is to silently ignore the problem. The `NEW` behavior for this policy is to report an error.

This policy was introduced in CMake version 2.8.0. Prior to removal in CMake version 4.0, it could be set by `cmake_policy()` or `cmake_minimum_required()`. If it was not set, CMake warned, and used `OLD` behavior.