>> Hello, I am trying to install guixsd with the installation image, my wireless
   >> internet provider allows me for only one MAC. The command I use to change the
   >> card mac on other distros and installation images is:
   >>
   >> ifconfig device hw ether NewMacAdress
   >>
   >> But with guixsd ifconfig fails telling me that the device can have only one
   >> address. Interesting to notice that I can put whatever device, even non existent
   >> names like "jlakjdj" and it tells the same thing, the device can only have on
   >> adress. I have an Atheros card.
   >
   > As I answered on IRC <https://gnunet.org/bot/log/guix/2015-07-09#T695806>,
   > my speculative guess is that perhaps ifconfig is patched on other
   > distros to handle this problem.

   I think most other distros use ‘ifconfig’ from net-tools, not from
   GNU inetutils.  If think this is just unimplemented.

   Can someone at bug-inetutils comment?

That  is  correct, GNU  ifconfig  does  not  support setting  the  MAC
address.