anchor.diff:  
   assert hostPlatform.isLinux;
   
  -with hostPlatform.platform.kernelHeadersBaseConfig;
  -
   let
  -  inherit (hostPlatform.platform) kernelHeadersBaseConfig;
     common = { version, sha256, patches ? null }: stdenvNoCC.mkDerivation {
       name = "linux-headers-${version}";
   
  
positive.code:     inherit patches;
  
      buildPhase = ''
        if test -n "$targetConfig"; then
           export ARCH=$platform
        fi
        make ${kernelHeadersBaseConfig} SHELL=bash
        make mrproper headers_check SHELL=bash
      '';
  
  
negative.code:       inherit sha256;
      };
  
      ARCH = hostPlatform.platform.kernelArch;
  
      # It may look odd that we use `stdenvNoCC`, and yet explicit depend on a cc.
      # We do this so we have a build->build, not build->host, C compiler.
  