anchor.diff:      patchShebangs .
       sed -i $JLIB/bin/profile.ijs -e "s@'/usr/share/j/.*'@'$out/share/j'@;"
   
  -    ./build_all.sh
  +    j64x="${j64x}" ./build_all.sh
   
       cp $SOURCE_DIR/bin/${platform}/j${bits}*/* "$JLIB/bin"
     '';
  
positive.code:     if stdenv.isLinux then "linux" else
      if stdenv.isDarwin then "darwin" else
      "unknown";
  
    doCheck = true;
  
  
negative.code: { stdenv, fetchFromGitHub, readline, libedit, bc
  , avxSupport ? false
  }:
  
  stdenv.mkDerivation rec {
    pname = "j";
  