$ git clone https://github.com/netbsd/src
Cloning into 'src'...
remote: Enumerating objects: 6112442, done.
remote: Counting objects: 100% (405/405), done.
remote: Compressing objects: 100% (157/157), done.
remote: Total 6112442 (delta 314), reused 248 (delta 248), pack-reused 6112037 (from 2)
Receiving objects: 100% (6112442/6112442), 3.33 GiB | 30.09 MiB/s, done.
Resolving deltas: 100% (4439958/4439958), done.
Updating files: 100% (206518/206518), done.
$ ./build.sh -O ../obj -U -u -m amd64 -N1 -j4 release
...