# CMP0042

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()`.

`MACOSX_RPATH` is enabled by default.

CMake 2.8.12 and newer has support for using `@rpath` in a target's install name. This was enabled by setting the target property `MACOSX_RPATH`. The `@rpath` in an install name is a more flexible and powerful mechanism than `@executable_path` or `@loader_path` for locating shared libraries.

CMake 3.0 and later prefer this property to be ON by default. Projects wanting `@rpath` in a target's install name may remove any setting of the `INSTALL_NAME_DIR` and `CMAKE_INSTALL_NAME_DIR` variables.

This policy was introduced in CMake version 3.0. 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.