CMP0144 CMake Warning in HPC: `Boost_ROOT`

[ax3l]

https://cmake.org/cmake/help/latest/policy/CMP0144.html

e.g. on Frontier with CMake 3.27.9:

CMake Warning (dev) at build/_deps/fetchedpicsar-src/multi_physics/QED/CMakeLists.txt:44 (find_package):
  Policy CMP0144 is not set: find_package uses upper-case <PACKAGENAME>_ROOT
  variables.  Run "cmake --help-policy CMP0144" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  Environment variable BOOST_ROOT is set to:

    /sw/frontier/spack-envs/cpe23.12-cpu/opt/cce-17.0.0/boost-1.85.0-usksrbcayou35f6nqrfaz6nocuerwdkd

  For compatibility, find_package is ignoring the variable, but code in a
  .cmake module might still use it.
This warning is for project developers.  Use -Wno-dev to suppress it.

I would set the policy to NEW, to supress the warning (or bump the minimal required CMake in PICSAR).