anchor.diff:      passAsFile = [ "kernelConfig" ];
   
       depsBuildBuild = [ buildPackages.stdenv.cc ];
  -    nativeBuildInputs = [ perl ]
  +    nativeBuildInputs = [ perl gmp libmpc mpfr ]
         ++ lib.optionals (stdenv.lib.versionAtLeast version "4.16") [ bison flex ];
   
       platformName = stdenv.hostPlatform.platform.name;
  
positive.code:       export buildRoot="''${buildRoot:-build}"
  
        # Get a basic config file for later refinement with $generateConfig.
        make HOSTCC=${buildPackages.stdenv.cc.targetPrefix}gcc -C . O="$buildRoot" $kernelBaseConfig ARCH=$kernelArch
  
        # Create the config file.
        echo "generating kernel configuration..."
  
negative.code: , perl
  , bison ? null
  , flex ? null
  , gmp ? null
  , libmpc ? null
  , mpfr ? null
  , stdenv
  
  , # The kernel source tarball.
  