The solution is simply to remove the -ocamlc and -ocamlopt stuff from the
Makefile. I have no idea why there were there, they seem buggy (they should
stop the build for users that don't have ocp-ocamlc.opt, which is all of
them); the reason why they didn't hurt before is because of the PR#6300
bug, which is that the -ocamlc, -ocamlopt option where ignored when
-use-ocamlfind was also used.

On Fri, Sep 19, 2014 at 9:43 PM, Jerry James <loganjerry@gmail.com> wrote:

> Greetings,
>
> I maintain a few ocaml packages for the Fedora Linux distribution,
> including tplib (https://gforge.inria.fr/projects/tplib).  Fedora
> Rawhide recently updated to ocaml 4.02.0.  Now tplib does not build
> successfully anymore.  It uses this command:
>
> ocamlbuild -cflag -g -lflag -g -ocamlc ocp-ocamlc.opt -ocamlopt
> ocp-ocamlopt.opt -classic-display -no-links -build-dir _build
> -use-ocamlfind src/tplib.mllib src/numeric.cmi src/semiring.cmi
> src/vector.cmi src/halfspace.cmi src/hypergraph.cmi src/tplib_core.cmi
> src/tplib_abstract.cmi src/numeric_plugins/zarith_plugin.cmxs
> src/bindings/tplib_double_callback.obj.o
> src/bindings/tplib_rational_callback.obj.o src/compute_ext_rays.native
> src/compute_ext_rays_polar.native src/compute_halfspaces.native
> src/compute_tangent_hypergraph.native
> src/compute_minimal_external_representations.native
> src/compute_tropical_complex.native
>
> which prompts ocamlbuild to issue this command:
>
> ocamlfind ocp-ocamlopt.opt unix.cmxa -I /usr/lib64/ocaml/ocamlbuild
> /usr/lib64/ocaml/ocamlbuild/ocamlbuildlib.cmxa -g -linkpkg
> myocamlbuild.ml /usr/lib64/ocaml/ocamlbuild/ocamlbuild.cmx -o
> myocamlbuild
>
> but ocamlfind doesn't know anything about an ocp-ocamlopt.opt command:
>
> Usage: ocamlfind query        [-help | other options] <package_name> ...
>    or: ocamlfind ocamlc       [-help | other options] <file> ...
>    or: ocamlfind ocamlcp      [-help | other options] <file> ...
>    or: ocamlfind ocamlmklib   [-help | other options] <file> ...
>    or: ocamlfind ocamlmktop   [-help | other options] <file> ...
>    or: ocamlfind ocamlopt     [-help | other options] <file> ...
>    or: ocamlfind ocamloptp    [-help | other options] <file> ...
>    or: ocamlfind ocamldep     [-help | other options] <file> ...
>    or: ocamlfind ocamlbrowser [-help | other options]
>    or: ocamlfind ocamldoc     [-help | other options] <file> ...
>    or: ocamlfind install      [-help | other options] <package_name>
> <file> ...
>    or: ocamlfind remove       [-help | other options] <package_name>
>    or: ocamlfind printconf    [-help] [variable]
>    or: ocamlfind list
>    or: ocamlfind pkg/cmd arg ...
> Select toolchain with:
>   ocamlfind -toolchain <t> <command>
> Abbreviations:
>   e.g. ocamlfind opt instead of ocamlfind ocamlopt
> Command exited with code 2.
>
> If I build with for Fedora 21 (ocaml 4.01.0) instead, that same
> ocambuild invocation results in this command being issued:
>
> ocamlfind ocamlopt unix.cmxa -I /usr/lib64/ocaml/ocamlbuild
> /usr/lib64/ocaml/ocamlbuild/ocamlbuildlib.cmxa -g -linkpkg
> myocamlbuild.ml /usr/lib64/ocaml/ocamlbuild/ocamlbuild.cmx -o
> myocamlbuild
>
> which works.  I found PR#6300, which deals with this issue, but don't
> understand what I need to do.  I tried moving the -use-ocamlfind flag
> to the first position on the command line, but that didn't help.  How
> does the ocamlbuild invocation need to be changed to avoid this
> problem?
>
> Thank you and regards,
> --
> Jerry James
> http://www.jamezone.org/
>
> --
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>