On Sun, Nov 15, 2009 at 08:27:49AM -0500, John Nowak wrote:
> I'm trying to call OCaml from C.
> [...] 
>    ocamlopt -output-obj hello.cmx -o hello.o

This is the main problem.  You're clobbering the hello.o that OCaml
produced when compiling hello.ml into native code.

> Does anyone have a correct set of instructions for doing this on
> non-Mac platforms? Thanks.

This worked fine for me:

  ocamlopt -output-obj -o temp.o hello.ml
  gcc -o hello main.c temp.o -L/usr/lib/ocaml -lasmrun -lm -ldl