building ocaml/ocsigen on heroku (doesn't work)

gistfile1.sh

#!/bin/sh

# Run this on an empty Heroku app:
# heroku create -s cedar -a my-ocsigen-test
# heroku -a my-ocsigen-test run bash

OCAML_URL=http://caml.inria.fr/pub/distrib/ocaml-3.12/ocaml-3.12.1.tar.gz
curl $OCAML_URL | tar xzf -
cd ocaml-3.12.1
./configure -prefix /app/ocaml -no-curses -no-tk
make world.opt
make install
cd

export PATH=/app/ocaml/bin/:$PATH

FINDLIB_URL=http://download.camlcity.org/download/findlib-1.2.1.tar.gz
curl $FINDLIB_URL | tar xzf -
cd findlib-1.2.1
./configure -sitelib /app/ocaml
make all
make install
cd

curl http://p.hagelb.org/pcre-config > /app/ocaml/bin/pcre-config
chmod 755 /app/ocaml/bin/pcre-config

OCSIGEN_URL=http://ocsigen.org/download/ocsigen-bundle-2.0.2c.tar.gz

curl $OCSIGEN_URL | tar xzf -
cd ocsigen-bundle-2.0.2c
./configure --with-missing-libs --prefix=/app/ocsigen --disable-sqlite3 --disable-libev

# WTF, needs system-level pcre-dev to continue:

make -C others
make install

make
make install
cd

-a isn't even a valid option on the current release of the heroku gem (it's --app).

@technomancy, did you ever get this to work? Do Clojure people know? :)