$ go get github.com/ethereum/go-ethereum
# cd .; git clone https://github.com/obscuren/sha3 /Users/peterv/go/src/github.com/obscuren/sha3
Cloning into '/Users/peterv/go/src/github.com/obscuren/sha3'...
remote: Repository not found.
fatal: repository 'https://github.com/obscuren/sha3/' not found