`cp -r` is deprecated on BSD/macOS. Use `cp -R` instead.

$ make all
...
./make-ca.sh: line 726: c_rehash: command not found
cook - ca-certificates stage
cook - ca-certificates unstage
cp: the -H, -L, and -P options may not be specified with the -r option.
./repo.sh failed.make: *** [build/filesystem.bin] Error 1

COMPATIBILITY
     Historic versions of the cp utility had a -r option.  This implementation
     supports that option; however, its use is strongly discouraged, as it
     does not correctly copy special files, symbolic links, or fifo's.

       -R, -r, --recursive
              copy directories recursively