On my system, attempts to build hop result in the following error: output path `/nix/store/l4jyrfyx8nr3sy6j20s8znk2aa2hpw84-hop-2.4.0.tar.gz' should have sha256 hash `04fhy5jp9lq12fmdqfjzj1w32f7nxc80fagbj7pfci7xh86nm2c5', instead has `1v2r4ga58kk1sx0frn8qa8ccmjpic9csqzpk499wc95y9c4b1wy3'
I tried downloading <ftp://ftp-sop.inria.fr/indes/fp/Hop/hop-2.4.0.tar.gz> manually with wget, and got the same file that guix had downloaded. Mark
