anchor.diff:  }:
   
   let
  -  inherit (stdenv.lib)
  -    enFlag
  -    wtFlag;
  +  inherit (lib)
  +    boolEn
  +    boolWt;
   in
   stdenv.mkDerivation rec {
     name = "upower-0.99.4";
  
positive.code:     "--disable-tests"
      "--enable-nls"
      "--with-backend=linux"
      (wtFlag "idevice" (
        libimobiledevice != null
        && libplist != null) null)
    ];
  
    NIX_LDFLAGS = [
  
negative.code:     "--localstatedir=/var"
      "--sysconfdir=/etc"
      "--disable-maintainer-mode"
      "--${boolEn (gobject-introspection != null)}-introspection"
      "--enable-deprecated"
      "--enable-manpages"
      "--disable-gtk-doc"
  