I've been trying to get oasis to build completely out-of-source.
Basically I want to use it as an ExternalProject in a C/C++ project that
uses CMake.

If I have the following files

~~~ oasis-simple/_oasis
OASISFormat : 0.4
Name : oasis-simple
Version : 0.0
Synopsis : A simple test of building oasis
Authors : Magnus Therning
License : BSD-3-clause

Executable "oasis-simple"
    Path : src
    MainIs : main.ml
    BuildTools : ocamlbuild
    BuildDepends : oasis
~~~

~~~ oasis-simple/src/main.ml
let () = print_string "Hello, World!"
~~~

then I can build out-of-source using the following steps:

    % mkdir ../oasis-simple-build; cd ../oasis-simple-build
    % oasis setup -oasis ../oasis-simple/_oasis
    % ocaml setup.ml -C $PWD/../oasis-simple -configure
    % ocaml setup.ml -C $PWD/../oasis-simple -build -build-dir $PWD/build

If I make it a little more complicated, by adding a syntax extension:

~~~ oasis-camlp4/_oasis
OASISFormat : 0.4
Name : oasis-camlp4
Version : 0.0
Synopsis : A slightly more complicated test of building oasis
Authors : Magnus Therning
License : BSD-3-clause

Executable "oasis-camlp4"
    Path : src
    MainIs : main.ml
    BuildTools : ocamlbuild
    BuildDepends : oasis, core, sexplib.syntax, threads
~~~

~~~ oasis-camlp4/src/main.ml
open Core.Std

type colour = Red | Green | Blue
    with sexp

let () = printf "Hello, World! (%s)\n" (sexp_of_colour Green |> Sexp.to_string)
~~~

Then I follow the same formula as above:

    % mkdir ../oasis-camlp4-build; cd ../oasis-camlp4-build
    % oasis setup -oasis ../oasis-camlp4/_oasis
    % ocaml setup.ml -C $PWD/../oasis-camlp4 -configure
    % ocaml setup.ml -C $PWD/../oasis-camlp4 -build -build-dir $PWD/build

Which results in an error:

~~~
+ /usr/bin/ocamldep.opt -modules src/main.ml > src/main.ml.depends
File "src/main.ml", line 12, characters 4-8:
Error: Syntax error
Command exited with code 2.
Compilation unsuccessful after building 1 target (0 cached) in 00:00:00.
E: Failure("Command ''/usr/bin/ocamlbuild' src/main.byte -tag debug -build-dir /home/magnus/devo/tmp/oasis-camlp4-build/build' terminated with error code 10")
~~~

What am I missing here, how do I get the second example to build?

/M

-- 
Magnus Therning                      OpenPGP: 0xAB4DFBA4 
email: magnus@therning.org   jabber: magnus@therning.org
twitter: magthe               http://therning.org/magnus

There does not now, nor will there ever, exist a programming language
in which it is the least bit hard to write bad programs.
     -- Flon's Axiom