libpulse-dev 1:0.9.21-0ubuntu5 (amd64 binary) in ubuntu lucid

 PulseAudio, previously known as Polypaudio, is a sound server for POSIX and
 WIN32 systems. It is a drop in replacement for the ESD sound server with
 much better latency, mixing/re-sampling quality and overall architecture.
 .
 Headers and libraries for developing applications that access a PulseAudio
 sound server via PulseAudio's native interface.