channels: final: prev: {
  __dontExport = true; # overrides clutter up actual creations

  inherit
    (channels.latest)
    nixd
    erpnext-app
    frappe-app
    frappe-erpnext-assets
    ;

  haskellPackages =
    prev.haskellPackages.override
    (old: {
      overrides = prev.lib.composeExtensions (old.overrides or (_: _: {})) (hfinal: hprev: let
        version = prev.lib.replaceChars ["."] [""] prev.ghc.version;
      in {
        # same for haskell packages, matching ghc versions
        inherit
          (channels.latest.haskell.packages."ghc${version}")
          haskell-language-server
          ;
      });
    });

  vimPlugins = prev.vimPlugins // {inherit (channels.latest.vimPlugins) nvim-lspconfig;};

  python3 = prev.python3.override {
    packageOverrides = pyfinal: pyprev: {
      inherit (channels.latest.python3.pkgs) bench erpnext frappe;
    };
  };
}