Hello,

Reporting from the deep trenches of core-updates, I have found this bug:

https://gitlab.kitware.com/cmake/cmake/issues/18865

The symptom in Guix is that packages cannot find Boost libraries.

A workaround that works for most (all?) packages is adding:

 #:configure-flags '("-DBoost_NO_BOOST_CMAKE=ON")

To disable the use of Boost-provided CMake scripts.  CMake already ships
with a FindBoost.cmake that works just fine.

I don't know what the "proper" fix would be, or whether it is worth a
huge rebuild.