forbidding \glissando from being at a page break

[Graham Percival]

With this code,
\relative c' {
  \repeat unfold 6 { c4 c c c }
  c1\glissando
  d'1
  \repeat unfold 7 { d4 d d d }
}

the \glissando occurs at a page break.  Is there any way to 
(automatically) force linebreaks to avoid this?

I currently have \glissando \noBreak everywhere in my music; I'm trying 
to eliminate the extra \noBreak commands.

Cheers,
- Graham