We'll use OCamlbuild from OCaml 3.12.1, rely on findlib/ocamlfind, use a few modules from the standard library that are not made available by default.
The code will take a fairly simple expression on the command-line and evaluate it:

We'll start with a simple code which simply prints its first command-line argument to stdout: The 'let () =' constructs makes it possible to evaluate the corresponding code at startup. We can compile the code with ocamlc or ocamlopt: We can also compile with ocamlbuild very easily: Unlike with ocamlopt, we don't completely control the name of the output file: if we ask ocamlbuild for '.native', it will use native-code compilation with ocamlopt and if we ask it for '.byte' instead, it will use bytecode compilation with ocamlc.