self: super: let prebuilt = self.stdenv.mkDerivation rec { pname = "iosevka-tv-1"; version = "15.6.3"; src = self.fetchurl { urls = [ "https://c.krebsco.de/iosevka-tv-1-${version}.tar.gz" "https://ni.krebsco.de/~tv/mirrors/iosevka/iosevka-tv-1-${version}.tar.gz" ]; sha256 = "0shsvlb1cmn39l33nzd5bj8g0h9jg7rdq8hvlac8qvnzfhpi5s6k"; }; installPhase = '' mkdir -p $out/share/fonts/truetype mv -v *.ttf $out/share/fonts/truetype ''; }; in if super.iosevka.version == prebuilt.version then prebuilt else super.iosevka