dan[benchplot]$ ocamlbuild -clean
Finished, 0 targets (0 cached) in 00:00:00.
00:00:00 0    (0   ) STARTING                                                                                                       -------- |ddan[benchplot]$ cat _tags
<benchplot.cm*>: package(archimedes), package(cairo2)
<plot_test.cm*>: package(archimedes), package(cairo2)
plot_test.ml: package(archimedes), package(cairo2)
plot_test.byte or plot_test.native: package(archimedes)
plottest.byte or plottest.native: package(archimedes)
dan[benchplot]$ ocamlbuild -use-ocamlfind plot_test.native -verbose 9
Failure: lexing: empty token.
Compilation unsuccessful after building 0 targets (0 cached) in 00:00:00.
dan[benchplot]$ cat _build/_log
### Starting build.
Doing sanity checks
# Compilation unsuccessful.
dan[benchplot]$ tail -n 3 plot_test.ml
  A.close vp

let () = plot [|1.0;1.5;2.3;3.2|]
dan[benchplot]$