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I suggest installing ocaml and opam from macports/apt-get. From there initialize opam and install core. Questions/difficulties should be directed to <firstname.lastname@example.org>. The easiest way to try sill is to install opam and then use "opam install sill". The opam version may be slightly out of date, so you may wish to install from the git repo instead. On a fresh Ubuntu VM the following commands successfully installed SILL (the last step is optional): git clone https://github.com/ISANobody/sill.git cd sill sudo apt-get install oasis opam m4 opam init <follow opam init instructions> opam install <the packages listed in opam/opam's depends field> ocaml setup.ml -configure ocaml setup.ml -build sudo ocaml setup.ml -install ./tester.sh After this "sill [options] <file>.sill" should be usable for your programs. See sill.grammar (https://github.com/ISANobody/sill/blob/master/sill.grammar) for SILL's syntax. Options are passed to sill via the following flags: -help prints out a short usage description -? prints out a short usage description -backend selects which backend to use. Currently supported are (Default: thread): thread Use OCaml's Thread module to support concurrency. This is currently the only backend that is full featured and well tested. This should be used unless you have a good reason to use the others. thread_async The asynchronous version of the threaded implementation. Since these semantics are fundamentally different than for -backend thread, this is most likely alternative backend to try. -interpstats is unsupported for this backend. fork Uses Unix.fork to handle concurrency. It communicates via fifos in a temporary directory. This doesn't clean up after itself. The temporary directory should be safe to remove after the program finishes executing. Correct execution should be identical to -backend thread, so other than demonstrating our backend flexibility, this may not be helpful (it does evade OCaml's cap on the number of simultaneous concurrently executing threads). The dynamic logging options -evaltrace and -interpstats will not work with this backend. ssh A truly distributed backend that uses ssh encrypted channels to connect processes. It is truly broken. -gkind select a global way to treat unconsumed linear channels (Default: linear): linear linear channels must be fully consumed via a wait statement one_weaken channels that are only missing their wait statement are allowed affine linear channels are treated as affine -dynchecks enable dynamic type checks. In theory, this confirms that executing processes dynamically conform to their static types. Currently, this is broken and should not be used. -evaltrace prints out a trace of the execution. Each process receives a number and information is tracked on a per process basis. Line/character numbers of the form @line:char proceed a short record of what occurred at each step in the process execution. -subtypetrace prints out information on the subtyping problems solved during typechecking. This is a bit messy, and, ideally, the default error messages should be informative enough to make this unneeded. -typetrace prints out rules that the type checker uses to typecheck the program. This is a bit messy, and, ideally, the default error messages should be informative enough to make this unneeded. -interpstats Gather statistics and print them after the end of execution. While, theoretically, this is backend dependent, but only 'thread' supports this flag so its output will be described here. Threads Created: The number of threads created during program execution Logical Threads: The number of threads that would have been created without the tail-bind optimization. Peak Exec Threads: The peak number of simultaneous threads. To add your own tests to the automatic test suite, add a program to either the 'tests' or 'failures' directories, with 'tests' for expected successes and 'failures' for expected failures. Next, for <filename>.sill, add either <filename>.sill.interp or <filename>.output to 'tests' to have either the programs evaluation trace or just its stdout diffed against its associated reference. For programs in 'failures' add <filename>.sill.error instead. WARNING: while the complete trace (i.e., <filename>.sill.interp) is probably "better" as a test, the trace can be sensitive to thread creation order, thus some "more concurrent" tests will need to arrange some deterministic output and rely only on <filename>.sill.output. To add your own backend, look in eval_functor.ml and the examples of eval_thread.ml etc. Since it's somewhat poorly documented, you should harass <email@example.com> about anything that is unclear. If, during use, you see a message that contains "BUG", please report it to <firstname.lastname@example.org>, these are internal errors and indicate something went seriously wrong. If you hate the worthless parsing errors, sorry.