I cannot reproduce it (x86_64):
Toggle snippet (9 lines)
$ git describev0.8.2-302-g4a3bcae$ ./pre-inst-env guix build cloog --no-substitutes
[...]
/gnu/store/k1wj5rwkipzqq2gg55s4p5baxhxzzy8h-cloog-0.18.0
Could you try to build it from the same Guix commit?
(You mentioned on IRC having non-deterministic Gettext test failures.For now, you could work around them either by retrying upon failure, orby enabling substitutes.)
TIA,Ludo’.