anchor.diff:  { stdenv
   , lib
   , fetchurl
  +, fetchpatch
   , makeWrapper
   , cmake
   , git
  
positive.code: 
    patches = [
      ./sw_vers.patch
    ];
  
    preConfigure = ''
      rm -rf builtins/*
  
negative.code:     zlib
      zstd
      libxml2
      llvm_9
      lz4
      xz
      gsl
  