]> > If I put everything into one big cma, then I have to recompile it every > small change. It takes so long time, that it would make no sense to use > the interpreter at all. in case you're doing so this way: ocamlc -o my.cma mod1.ml mod2.ml mod3.ml mod4.ml this will recompile everything, but you can use in your makefile: %.cmo: %.ml ocamlc.opt -c $< my.cma: mod1.cmo mod2.cmo mod3.cmo mod4.cmo ocamlc.opt -a -o $@ $^ then you don't recompile everything, only the modified module if there are dependencies between modules, just add additional rules: modfoo.cmo: modfoo.ml modbar.cmi