Merge topic 'doc-xref-find-env-vars' c584882b26 Help: change links to point to the env.vars, not to the cmake vars e40d4eb644 Help: add documentation for some CMAKE_XXX_PATH env.vars 73ce0b792f Help: minor improvement for the CMAKE_PREFIX_PATH docs Acked-by: Kitware Robot <kwrobot@kitware.com> Merge-request: !8444