# CMP0144

New in version 3.27.

`find_package()` uses upper-case `<PACKAGENAME>_ROOT` variables.

In CMake 3.27 and above the `find_package(<PackageName>)` command now searches prefixes specified by the upper-case `<PACKAGENAME>_ROOT` CMake variable and the `<PACKAGENAME>_ROOT` environment variable in addition to the case-preserved `<PackageName>_ROOT` and `<PackageName>_ROOT` variables used since policy `CMP0074`. This policy provides compatibility with projects that have not been updated to avoid using `<PACKAGENAME>_ROOT` variables for other purposes.

The `OLD` behavior for this policy is to ignore `<PACKAGENAME>_ROOT` variables if the original `<PackageName>` has lower-case characters. The `NEW` behavior for this policy is to use `<PACKAGENAME>_ROOT` variables.

This policy was introduced in CMake version 3.27. CMake version 3.28.0-rc1 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.