I installed a prior version of OCaml using opam switch create 4.10.2 on MacOS Silicon system: Ventura 13.0.1. I need to install the matching version of camlp4 to be accessible by it. Although I have installed a more recent version of camlp4 my Ocaml switch does not find it.
% opam switch create 4.10.2
...
∗ installed ocaml.4.10.2
Done.
# Run eval $(opam env --switch=4.10.2) to update the current shell environment
% eval $(opam env --switch=4.10.2)
When I run a shell script to make an OCamll package, I get the following error:
sh: camlp4rf: command not found
Cannot find file camlp4/camlp4r.cma.
% ocaml
OCaml version 4.10.2
% opam --version
2.1.4
% which camlp4
camlp4 not found
% camlp5 -version
8.00.04
% camlp4 -version
zsh: command not found: camlp4
.../.opam/4.10.2/bin
contains many OCaml files but no camlpm
.../.opam/4.10.2/.opam-switch also conatins many OCaml files but not camlp4
In contrast, the not found files exist in the opam default version:
locate camlp4rf
.../.opam/default/bin/camlp4rf
.../.opam/default/bin/camlp4rf.opt
.../.opam/default/lib/ocaml/camlp4/camlp4rf.cma
How do I get them found and recognized by the switch? Or how do I install the camlp4 with opam switch?
I tried running the package with OCaml 5 and camlp5, and with OCaml 4.14.1 neither of which work since the package requires commands and files no longer a part of these later versions.
You can install camlp4 within your switch with
$ opam install camlp4
you may want to check that your shell environment is pointing towards the right switch with
$ opam switch
before however.