deadManAlive/ocaml-on-msys2.md

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Installing Ocaml (latest w/o opam) in Windows via MSYS2

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ocaml-on-msys2.md

Installing OCaml (latest w/o opam) in Windows via MSYS2

Preparation: MSYS2 MinGW64, make sure git, make, diffutils, and gcc installed, e.g. with pacman -S git make diffutils mingw-w64-x86_64-gcc.
git clone https://github.com/ocaml/ocaml.git.
git submodule update --init.
./configure, then make, and then install with make install.

At this point ocaml, ocamlc, and ocamlopt is already installed on the MSYS2 MinGW64 environment, but you'll hit by error like "Unbound module Stdlib".

Check standard_library location via ocamlc -config, should be /mingw64/lib/ocaml.
Set environment variable CAMLLIB to that location (add export CAMLLIB="/mingw64/lib/ocaml" in ~/.bashrc).
Done.

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