conda nix expression based on v4.3.31 in nixpkgs (force install)

conda.nix

# ref: http://www.jaakkoluttinen.fi/blog/conda-on-nixos/
# ref: https://github.com/NixOS/nixpkgs/blob/af9d10a91b5ef0518ee12b220470735076974210/pkgs/tools/package-management/conda/default.nix
with import <nixpkgs> {};

let
  condaDeps = [ stdenv.cc xorg.libSM xorg.libICE xorg.libXrender libselinux ];
  extraPkgs = [ which ];
  python_version = "2";
  conda_version = "4.6.14";
  src = fetchurl {
      url = "https://repo.continuum.io/miniconda/Miniconda${python_version}-${conda_version}-Linux-x86_64.sh";
      # nix-prefetch-url <path-to-installer.sh>
      sha256 = "0kbgvjm8ca23d35n32srz3ys6c6aj25idg9hxr2lqahsz9d4481y";
  };
   installationPath = "$HOME/.conda";

  conda = runCommand "conda-install" { buildInputs = [ makeWrapper ]; }
    ''
      chmod +x ${src}
      mkdir -p $out
      ${src} -b -u -p $out/.conda
    '';
in
  (buildFHSUserEnv {
    name = "conda";
    targetPkgs = pkgs: (builtins.concatLists [ [ conda ] condaDeps extraPkgs ]);
    profile = ''
      # Add conda to PATH
      export CONDAHOME=${conda}/.conda
      export PATH=$CONDAHOME/bin:$PATH
      # Paths for gcc if compiling some C sources with pip
      export NIX_CFLAGS_COMPILE="-I$CONDAHOME/include"
      export NIX_CFLAGS_LINK="-L$CONDAHOME/lib"
      # Some other required environment variables
      export FONTCONFIG_FILE=/etc/fonts/fonts.conf
      export QTCOMPOSE=${xorg.libX11}/share/X11/locale
    '';

    meta = {
      description = "Conda is a package manager for Python";
      homepage = https://conda.io/;
      platforms = lib.platforms.linux;
      license = lib.licenses.bsd3;
      # this is derived from the conda expression in nixpkgs
      # maintainers = with lib.maintainers; [ jluttine bhipple ];
    };
    runScript = "conda";
  })