libcsnd-dev - 1:6.18.1+dfsg-1+b2 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.