{
  stdenv,
  iosevka,
  nerd-font-patcher,
}: let
  customBuildPlan = {
    noCvSs = true;
    exportGlyphNames = false;
    ligations.inherits = "dlig";
    weights = {
      Regular = {
        shape = 400;
        menu = 400;
        css = 400;
      };
      Bold = {
        shape = 700;
        menu = 700;
        css = 700;
      };
    };
    variants.design = {
      capital-g = "toothless-corner-serifless-hooked";
      capital-j = "serifed-both-sides";
      capital-q = "crossing";
      capital-r = "curly-serifless";
      e = "rounded";
      f = "tailed";
      g = "double-storey-open";
      i = "tailed-serifed";
      j = "serifed";
      k = "cursive-serifless";
      l = "tailed-serifed";
      q = "diagonal-tailed-serifless";
      y = "cursive-serifless";
      z = "straight-serifless-with-horizontal-crossbar";
      lower-delta = "flat-top";
      lower-lambda = "tailed-turn";
      lower-xi = "flat-top";
      lower-chi = "semi-chancery-straight";
      zero = "tall-slashed";
      one = "no-base";
      two = "straight-neck";
      three = "flat-top";
      four = "semi-open";
      five = "oblique-arched";
      six = "open-contour";
      seven = "bend-serifless-crossbar";
      eight = "two-circles";
      nine = "open-contour";
      asterisk = "hex-low";
      underscore = "high";
      caret = "high";
      paren = "normal";
      brace = "straight";
      number-sign = "slanted";
      ampersand = "closed";
      at = "fourfold";
      percent = "dots";
      question = "corner";
      lig-ltgteq = "flat";
      lig-neq = "more-slanted";
      lig-equal-chain = "without-notch";
      lig-hyphen-chain = "without-notch";
      lig-double-arrow-bar = "without-notch";
      lig-single-arrow-bar = "without-notch";
    };
  };
in {
  etoile = rec {
    name = "Iosevka Custom Etoile";
    package = iosevka.override {
      set = "etoile";
      privateBuildPlan = {
        inherit (customBuildPlan) noCvSs exportGlyphNames variants weights;
        family = name;
        spacing = "quasi-proportional";
        serifs = "slab";
      };
    };
  };
  aile = rec {
    name = "Iosevka Custom Aile";
    package = iosevka.override {
      set = "aile";
      privateBuildPlan = {
        inherit (customBuildPlan) noCvSs exportGlyphNames variants weights;
        family = name;
        spacing = "quasi-proportional";
        serifs = "sans";
      };
    };
  };
  nerdfont = let
    font = iosevka.override {
      set = "custom";
      privateBuildPlan = {
        inherit (customBuildPlan) noCvSs exportGlyphNames variants weights;
        family = "Iosevka Custom";
        spacing = "normal";
        serifs = "sans";
      };
    };
  in {
    name = "IosevkaCustomNerdFont";
    package = stdenv.mkDerivation {
      name = "${font.name}-nerd-font-patched";
      src = font;
      nativeBuildInputs = [nerd-font-patcher];
      buildPhase = ''
        find \( -name \*.ttf -o -name \*.otf \) -execdir nerd-font-patcher -c {} \;
      '';
      installPhase = "cp -a . $out";
    };
  };
}