anchor.diff: -{ stdenv, fetchurl
  +{ stdenv
  +, fetchurl
   , perl
   , bc
   , openssl
  
positive.code:   };
  
    nativeBuildInputs = [
      perl
      bc
    ];
  
    buildInputs = [
  
negative.code:   configureFlags = [
      "--disable-debug"
      "--with-werror"
      # Flag is not a boolean
      #"--disable-static-link"
      "--with-pythonpath"
      # Flag is not a boolean
      "--with-gtest-source=${googletest}/src/gtest"
  