On Tue, Jan 02, 2018 at 08:04:53PM +0100, Konrad Hinsen wrote: > * gnu/packages/python.scm (python2-mmtk): New public variable. Thanks! > + (add-before 'build 'includes-from-scientific > + (lambda* (#:key inputs #:allow-other-keys) > + (invoke "cp" "-r" > + (string-append > + (assoc-ref inputs "python-scientific") > + "/include/python2.7/Scientific") > + "Include/")))))) Is it possible to make this use the copy-recursively instead of `cp`? I did try it naively and it didn't work.