> I'm trying to link an ocamlopt-generated object file into a C program by 
> following instructions on http://caml.inria.fr/ocaml/htmlman/manual032.html
> Currently it seems that main is already defined in libasmrun and some 
> symbols are missing from it.
> cc -L /usr/lib/ocaml -lasmrun -ldl -lm -lcurses -o prog modwrap.o 
> mod_from_ml.o main.c

You have a linking order problem.  Remember that Unix linkers are
*very* sensitive to the order of libraries on the command-line.
(See the Info page for gcc, section "Options for linking", for more info.)
Just put the libraries (-lxxx) last on the line and everything will
work fine.

- Xavier Leroy