header issues

[Michiel Lange]

Have been looking around a little, and this can be something where I am 
doing very stupid things...

Take the following simple lilypond file:
--- BEGIN ---
\version "2.6.3"

\header {
   title="A string with é è ê and so on"
   author="The Author is éèêks"
   subsubtitle="súbsùbsûb title"
}

music={c d e f}

\score {
<<
   \context PianoStaff
   <<
       \context Staff = "mystaff"
       <<
            \music
       >>
   >>
>>
\layout {}
}
--- END ---

The output I get (pdf at least) shows the header without all the 
specialties, and missing some of the normal letters too. If I change 
those special letters to their normal equivalents the output is what one 
would expect.

The question is: how can I get these letters in my header so I can keep 
using a correct spelling of words?
(oh: and on 2.6.3 on windows I tried to \include "italiano.ly" but then 
I get strange errors about bad syntax at music={...})

Thanks in advance,
Michiel