With Guix commit (ab9629b7c91ff7d6392a03512cfe442823267777), building git fails because of a hash mismatch when downloading the man pages (see log below). I'd be happy to submit a patch that updates the hash, but it's perhaps worth figuring out first what went wrong here.
Konrad. building /gnu/store/lml7vf4rqr9g08bkfwbs3hrchv90zvpb-git-manpages-2.31.0.tar.xz.drv... downloading from http://linux-kernel.uio.no/pub/software/scm/git/git-manpages-2.31.0.tar.xz ... -sha256 hash mismatch for /gnu/store/cp276zg8yn1v0psi49d8ivib41cv99ya-git-manpages-2.31.0.tar.xz: expected hash: 1aiabqbc6mg23r19g2cwd4iajf55cpkxqylwn14hgpg64piaqr2y actual hash: 1v40wwj130k76xf2w6vwhvfpkk765q1gcy5bqcrqssxf66ydqp8q hash mismatch for store item '/gnu/store/cp276zg8yn1v0psi49d8ivib41cv99ya-git-manpages-2.31.0.tar.xz' build of /gnu/store/lml7vf4rqr9g08bkfwbs3hrchv90zvpb-git-manpages-2.31.0.tar.xz.drv failed
