Running contrib/install_db4.sh to download and build libdb4 for legacy wallet support fails on FreeBSD.
$ ./contrib/install_db4.sh `pwd`
[...]
sha256sum: option requires an argument -- c
usage: sha256sum [-pqrtx] [-c file] [-s string] [files ...]
$
This is on FreeBSD 13.1
Fixed by: #26772
