I haven't used OCamlMakefile, but Brian Zimmer wanted to, and figured out the following invocation to use it. Your Makefile should contain something like this:
OCAMLMAKEFILE := /opt/local/godi/share/OCamlMakefile PACKS = pa_arg # other syntax extensions here ... PP = camlp4find $(PACKS) export PP include $(OCAMLMAKEFILE)
and your sourcefile (that uses pa_arg) should begin with
(*pp $PP *)
Brian warns that he couldn't get it to work with the version of OCamlMakefile available from godi (as of 2007-02-27), but it worked with the later version (6.24.5) available at OCamlMakefile's site.