Hi Efraim and Simon, thank you for your very quick reply! I read your messages after I tried my "guix build" attempt zimoun writes: > Dear, > > Ah the joy of in-place replacement! :-D Actually this is a in-place *displacement* (with HTML) :-O Fortunately Guix is amazing \O/ Anyway: I guess there will be potentially other issues like this one in the future (permanent redirections to web pages instead of sources) and unfortunately (AFAIU) Guix will not be able to use alternative sources like Software Heritage: WDYT about considering 301 and 302 HTTP codes as "soft failures" and making Guix considering the alternative sources? Problems like this one are very bad for our time machine, I'm just thinking if Guix can do something to prevent them. [...] >> Please how can I fix this situation? > > guix download http://ci.guix.gnu.org/nar/0zh5mvhgcx0198k7j6p5pgrc5krgxyqj-icu4c-64_2-src.tgz Oh yes... download (preseed the file)! I did: --8<---------------cut here---------------start------------->8--- $ guix download https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-src.tgz Starting download of /tmp/guix-file.QYSPMo From https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-src.tgz... following redirection to `https://github-production-release-asset-2e65be.s3.amazonaws.com/49244766/c239d900-615b-11e9-9f18-c7c2f6baa47b?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200702%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200702T131303Z&X-Amz-Expires=300&X-Amz-Signature=5b743b3a38385952bde1807ac6c8f387e534650a49cf2f533bb04164cf0bc255&X-Amz-SignedHeaders=host&actor_id=0&repo_id=49244766&response-content-disposition=attachment%3B%20filename%3Dicu4c-64_2-src.tgz&response-content-type=application%2Foctet-stream'... icu4c-64_2-src.tgz 22.9MiB 11.5MiB/s 00:02 [##################] 100.0% /gnu/store/0zh5mvhgcx0198k7j6p5pgrc5krgxyqj-icu4c-64_2-src.tgz 0v0xsf14xwlj125y9fd8lrhsaych4d8liv8gr746zng6g225szb2 --8<---------------cut here---------------end--------------->8--- and guix pull is going on now, building half of the world! :-) [...] Thanks a lot! Gio' -- Giovanni Biscuolo Xelera IT Infrastructures