ghostscript-8.70-6 broke my lilypond, no more PDF

[ivan . k . kuznetsov]

I am using lilypond 2.12.3 under CentOS 5.6.  Recently,
I ran the CentOS recommended updates and I updated from
ghostscript-8.15.2-9.12 to ghostscript-8.70-6.

Since that time, lilypond no longer works for me in that
lilypond .ps files but no longer produces .pdf files.
Here is what the output at the command line look like:

   
   GNU LilyPond 2.12.3
   Processing `song02.ly'
   Parsing...
   Interpreting music... [8][16][24][32]
   Preprocessing graphical objects...
   Finding the ideal number of pages...
   Fitting music on 1 page...
   Drawing systems...
   Layout output to `song02.ps'...
   Converting to `./song02.pdf'...
   `gs -q -dSAFER -dDEVICEWIDTHPOINTS=612.00 -dDEVICEHEIGHTPOINTS=792.00
   -dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH -r1200 -sDEVICE=pdfwrite
   -sOutputFile="./song02.pdf" -c .setpdfwrite -f "song02.ps"' failed (256)
   error: failed files: "song02.ly"

Have I stumbled onto a bug?  How can I get lilypond to
produce PDF files again.

Evidentally, it is not so easy to roll back updates
under CentOS.