anchor.diff:  
     configureFlags = [
       "--enable-ncurses"
  +    "lib_cv_va_copy=yes"
  +    "lib_cv___va_copy=yes"
     ] ++ lib.optionals stdenv.isLinux [
       "--enable-audio=oss,alsa,jack"
       "--enable-alsaseq"
       "--with-default-output=alsa"
  +    "lib_cv_va_val_copy=yes"
     ] ++ lib.optionals stdenv.isDarwin [
       "--enable-audio=darwin,jack"
  +    "lib_cv_va_val_copy=no"
  +  ];
  +
  +  makeFlags = [
  +    "AR=${stdenv.cc.targetPrefix}ar"
     ];
   
     NIX_LDFLAGS = "-ljack -L${libjack2}/lib";
  
positive.code:     url = "http://www.csee.umbc.edu/pub/midia/instruments.tar.gz";
      sha256 = "0lsh9l8l5h46z0y8ybsjd4pf6c22n33jsjvapfv3rjlfnasnqw67";
    };
  
    # the instruments could be compressed (?)
    postInstall = ''
  
negative.code: { lib, stdenv, fetchurl
  , pkg-config, buildPackages
  , CoreAudio, alsa-lib, libjack2, ncurses
  }:
  
  stdenv.mkDerivation rec {
    pname = "timidity";
  