We are missing some constraints in opam. js_of_ocaml-toplevel.3.4.0 requires js_of_ocaml-compiler.3.4.0 but you have version 3.3.0 installed. > [NOTE] Package js_of_ocaml-compiler is already installed (current version is 3.3.0). try to upgrade your packages On Thu, May 30, 2019 at 4:28 AM Quaker Quickoats wrote: > okay, not sure, still cannot install js_of_ocaml-toplevel with the same > error after opam full update > > On Tue, 28 May 2019 at 20:40, Kenichi Asai wrote: > >> Thanks for the e-mail. Yes, you need js_of_ocaml-toplevel and some >> other js_of_ocaml packages. I also installed them with opam 2.0.4: >> >> > js_of_ocaml 3.4.0 >> > js_of_ocaml-compiler 3.4.0 >> > js_of_ocaml-ppx 3.4.0 >> > js_of_ocaml-toplevel 3.4.0 >> >> On MacOS, I had no problem installing them... >> >> -- >> Kenichi Asai >> >