As a temporary workaround, replace cmake -E tar <options> by the
equivalent tar <options> command to unpack *.tar.xz files in the
This workaround should be left in place until the current CMake fix by
Brad King (import the latest version of the libarchive source code
into CMake) that finally allows cmake -E tar ... to work on *.tar.xz
files gets propagated to a CMake release.