libcsnd-dev - 1:6.12.2~dfsg-3.1 main

This package contains the development files needed to build programs
using the C++ bindings to the Csound library. It also includes the
development symlink for the lua module, but you have to manually
install liblua5.1-luacsnd for that to work.
.
For more information on Csound, see the csound package.