Neither do the files copied by the `add_emacs_lisp_target` macro in line 27 contain `${VAR}` or `@VAR@` statements - still they are copied using the `configure_file` function. I just didn't want to mess with the general style of the code. For the sake of consistency I stayed with the piece of code, assuming that `configure_file` was used for a reason, possibly inclusion of  `${VAR}` or `@VAR@` statements in the future.