I would like to produce an abbreviated command for camlp4 mylexer.cmo mypa_o.cmo pa_extend.cmo q_MLast.cmo pr_dump.cmo\ pa_bindlib.cmo I tried to mimic the compilation of camlp4o: ocamlc -I +camlp4 odyl.cma camlp4.cma mylexer.cmo mypa_o.cmo\ pa_bindlib.cmo pr_dump.cmo odyl.cmo -o camlp4bo But when I try to use ocamlp4bo, it produces no output ... What am I doing wrong ?