anchor.diff:  { fetchurl, stdenv, sqlite, pkgconfig, xapian, glib, gmime, texinfo, emacs, guile
  -, gtk3, webkit, libsoup, icu }:
  +, gtk3, webkit, libsoup, icu, withMug ? false /* doesn't build with current gtk3 */ }:
   
   stdenv.mkDerivation rec {
     version = "0.9.9.5";
  
positive.code:   '';
  
    # Install mug and msg2pdf
    postInstall = ''
      cp -v toys/msg2pdf/msg2pdf $out/bin/
      cp -v toys/mug/mug $out/bin/
    '';
  
negative.code:     sha256 = "1hwkliyb8fjrz5sw9fcisssig0jkdxzhccw0ld0l9a10q1l9mqhp";
    };
  
    buildInputs =
      [ sqlite pkgconfig xapian glib gmime texinfo emacs guile libsoup icu ]
      ++ stdenv.lib.optional withMug [ gtk3 webkit ];
  
    preBuild = ''
      # Fix mu4e-builddir (set it to $out)
  