xschem: 3.1.0 -> 3.4.4

stdenv.mkDerivation rec {

  pname = "xschem";

  version = "3.1.0";

  version = "3.4.4";

  src = fetchFromGitHub {

    owner = "StefanSchippers";

    repo = "xschem";

    rev = version;

    sha256 = "sha256-SHpESg5mn9lSDOURQusQUsug8Jqin/W5rqkVgmseSgA=";

    sha256 = "sha256-1jP1SJeq23XNkOQgcl2X+rBrlka4a04irmfhoKRM1j4=";

  };

  nativeBuildInputs = [ bison flex pkg-config ];