nixpkgs/pkgs/development/compilers/ocaml/4.11.nix

import ./generic.nix {
  major_version = "4";
  minor_version = "11";
  patch_version = "2";
  sha256 = "1m3wrgkkv3f77wvcymjm0i2srxzmx62y6jln3i0a2px07ng08l9z";
}