To compile a program as Concurrent Haskell, use the `-concurrent' option, both when compiling and linking. You will probably need the `-fglasgow-exts' option, too.
Three RTS options are provided for modifying the behaviour of the threaded runtime system. See the descriptions of `-C[<us>]', `-q', and `-t<num>' in Section See section RTS options for Concurrent/Parallel Haskell.