anchor.diff:  { stdenv, fetchurl, pkgconfig, intltool, gperf, libcap, dbus, kmod
   , xz, pam, acl, cryptsetup, libuuid, m4, utillinux, usbutils, pciutils
  -, glib, kbd, libxslt, coreutils
  +, glib, kbd, libxslt, coreutils, libgcrypt
   }:
   
   assert stdenv.gcc.libc or null != null;
  
positive.code:       # lead to a cyclic dependency.
        "-DPOLKIT_AGENT_BINARY_PATH=\"/run/current-system/sw/bin/pkttyagent\""
        "-fno-stack-protector"
      ];
  
    makeFlags = "CPPFLAGS=-I${stdenv.gcc.libc}/include";
  
negative.code: 
    buildInputs =
      [ pkgconfig intltool gperf libcap dbus kmod xz pam acl
        /* cryptsetup */ libuuid m4 usbutils pciutils glib libxslt libgcrypt
      ];
  
    configureFlags =
  