Need help with upgrade from 2.2 to 2.10

[Alan McConnell]

I grabbed the big .gz from your site and ran the install.  It
seemed to work fine.  But I now when I run    lilypond  testfile.ly  ,
I get the error message:

/usr/local//lilypond/usr/bin/lilypond: relocation error:
/usr/local/lilypond/usr/lib/libguile.so.17: symbol regexec, version GLIBC_2.3.4
not defined in file libc.so.6 with link time reference

I am running a very ancient Debian sarge, which I hope to upgrade to etch in
a week or so.  Can I fix the above error before that, or is it best to wait
till I have etch working?

TIA for help and best wishes,

Alan