$ guix environment --pure guix --ad-hoc git guile-json guile-readline
$ make 
[ 11%] LOAD     guix/scripts/download.scm
ice-9/eval.scm:293:34: error: hash-algorithm: unbound variable

guix master commit 51443772b80c5ca51ccbe5cf05c5db4c216a7b66
on Ubuntu 16.04 on armhf.