curly bracket with GrandStaff; ly2dvi -p vs -P

[Graham Percival]

I don't know if this a problem with my postscript installation or an
actual lilypond bug...

When I execute "ly2dvi -P foo.ly" on my score, the postscript version
has a curly bracket that stretches from the bottom of the lowest staff
to the top of the highest staff.  When I execute "ly2dvi -p foo.ly", the
postscript(and pdf) versions a curly bracket that doesn't even cover the
two middle staffs, and doesn't touch the lowest and highest staffs at
all.

----
\score { \context GrandStaff = gs <
        \context Staff = one { \notes{ c2 }}
        \context Staff = two { \notes {c2}}
        \context Staff = three { \notes{c2}}
        \context Staff = four { \notes{c2}}
>
\paper{}}
----

This is with 1.6.2, compiled into a deb (IIRC I used "debuild -B") and
installed via dpkg.  The rest of my system is an up-to-date
Debian/Testing.

Cheers,
- Graham Percival