libnacl-dev 20110221-11 (s390x binary) in ubuntu kinetic

 NaCl (pronounced "salt") is a new easy-to-use high-speed
 software library for network communication, encryption,
 decryption, signatures, etc. NaCl's goal is to provide
 all of the core operations needed to build higher-level
 cryptographic tools.
 This package contains header and library files needed
 for software development that makes use of NaCl.