# CMP0042

`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. CMake version 3.18.0-rc4 warns when the policy is not set and uses `OLD` behavior. Use the `cmake_policy()` command to set it to `OLD` or `NEW` explicitly.

Note

The `OLD` behavior of a policy is `deprecated by definition` and may be removed in a future version of CMake.