### Starting build.
# Target: src/ftest.ml.depends, tags: { extension:ml, file:src/ftest.ml, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/ftest.ml > src/ftest.ml.depends
# Target: src/gfile.mli.depends, tags: { extension:mli, file:src/gfile.mli, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/gfile.mli > src/gfile.mli.depends # cached
# Target: src/graph.mli.depends, tags: { extension:mli, file:src/graph.mli, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/graph.mli > src/graph.mli.depends # cached
# Target: src/graph.cmi, tags: { byte, compile, extension:mli, file:src/graph.mli, include, interf, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlc.opt -c -I src -o src/graph.cmi src/graph.mli # cached
# Target: src/gfile.cmi, tags: { byte, compile, extension:mli, file:src/gfile.mli, include, interf, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlc.opt -c -I src -o src/gfile.cmi src/gfile.mli # cached
# Target: src/tools.mli.depends, tags: { extension:mli, file:src/tools.mli, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/tools.mli > src/tools.mli.depends
# Target: src/tools.cmi, tags: { byte, compile, extension:mli, file:src/tools.mli, include, interf, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlc.opt -c -I src -o src/tools.cmi src/tools.mli
# Target: src/ftest.cmo, tags: { byte, compile, extension:cmo, extension:ml, file:src/ftest.cmo, file:src/ftest.ml, implem, include, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlc.opt -c -I src -o src/ftest.cmo src/ftest.ml
# Target: src/gfile.ml.depends, tags: { extension:ml, file:src/gfile.ml, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/gfile.ml > src/gfile.ml.depends # cached
# Target: src/graph.ml.depends, tags: { extension:ml, file:src/graph.ml, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/graph.ml > src/graph.ml.depends # cached
# Target: src/graph.cmx, tags: { compile, extension:cmx, extension:ml, file:src/graph.cmx, file:src/graph.ml, implem, include, native, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlopt.opt -c -I src -o src/graph.cmx src/graph.ml # cached
# Target: src/gfile.cmx, tags: { compile, extension:cmx, extension:ml, file:src/gfile.cmx, file:src/gfile.ml, implem, include, native, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlopt.opt -c -I src -o src/gfile.cmx src/gfile.ml # cached
# Target: src/tools.ml.depends, tags: { extension:ml, file:src/tools.ml, include, ocaml, ocamldep, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamldep.opt -modules src/tools.ml > src/tools.ml.depends
# Target: src/tools.cmx, tags: { compile, extension:cmx, extension:ml, file:src/tools.cmx, file:src/tools.ml, implem, include, native, ocaml, quiet, traverse }
/mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlopt.opt -c -I src -o src/tools.cmx src/tools.ml
+ /mnt/commetud/GEI/OCaml/.opam/4.14.0/bin/ocamlopt.opt -c -I src -o src/tools.cmx src/tools.ml
File "src/tools.ml", line 1:
Error: The implementation src/tools.ml
       does not match the interface src/tools.cmi: 
       The value `add_arc' is required but not provided
       File "src/tools.mli", line 5, characters 0-54: Expected declaration
Command exited with code 2.
# Compilation unsuccessful.