anchor.diff:      }
     '';
   
  +  libcConfig = lib.optionalString useMusl ''
  +    CONFIG_FEATURE_UTMP n
  +    CONFIG_FEATURE_WTMP n
  +  '';
   in
   
   stdenv.mkDerivation rec {
  
positive.code: { stdenv, lib, buildPackages, fetchurl, fetchpatch
  , enableStatic ? false
  , enableMinimal ? false
  , useMusl ? false, musl
  , extraConfig ? ""
  , buildPlatform, hostPlatform
  }:
  
  let
    configParser = ''
  
negative.code: 
      ${extraConfig}
      CONFIG_CROSS_COMPILER_PREFIX "${stdenv.cc.targetPrefix}"
      ${libcConfig}
      EOF
  
      make oldconfig
  