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Subject: [Caml-list] compiling custom runtime

On trunk compiler, I'm trying to add a function to the runtime
but cannot get the ocaml to compile. make world stops on:

boot/ocamlrun boot/ocamlc -nostdlib -I boot  -compat-32 -o ocamlc \
           compilerlibs/ocamlcommon.cma compilerlibs/ocamlbytecomp.cma driver/main.cmo
File "_none_", line 1:
Error: Error while linking boot/stdlib.cma(Array):
The external function `caml_create_vect' is not available

(caml_create_vect being the name of the function I added).

I tried to make ocamlrun in byterun and copy it in boot but it didn't
solve the problem.

How to bootstrap the compiler with a new function?
Shouldn't this be documented in the README?