Fyi, scrypt is in the Debian testing and unstable repos [1], and Ubuntu's universe repo [2]. Not sure about the RPM ecosystem, but I'm sure it's available there too. And there are a bunch of bindings and libs in various languages on github as well [3]. And there is always the source [4].
1. http://packages.debian.org/search?keywords=scrypt
2. http://packages.ubuntu.com/search?keywords=scrypt
3. https://github.com/search?q=scrypt&type=Repositories
4. http://www.tarsnap.com/scrypt.html