Hi, When I try to build it the second time it's built just fine. I'm not sure what's could be the reason of that "glitch". --8<---------------cut here---------------start------------->8--- > ./pre-inst-env guix build -K clisp --rounds=2 /gnu/store/f5bwwqq5z90jzqs0vcf3mx79vddb68hy-clisp-2.49-92 --8<---------------cut here---------------end--------------->8--- CC mentors for wise advice. -- Oleg