guile 1.8 required?

[Graham Percival]

Is guile 1.8 officially required now?  If so, could we add this to 
./configure?

This would be an unfortunate requirement, since few OSes have packaged 
guile yet -- at least freebsd, debian, and fink do not have it.


Build (with guile 1.6.7) fails with:

home/gperciva/usr/bin/::"
[/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/lily.scm]
[/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/lily-library.scm][/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/file-cache.scm][/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/define-event-classes.scmBacktrace:
In 
/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/lily.scm:
 227: 0* [for-each #<procedure ly:load #> #]
In /usr/local/share/guile/1.6/srfi/srfi-1.scm:
 663: 1  (if (null? rest) (letrec ((lp #)) (lp list1)) ...)
   ...
 667: 2  (begin (f (car l)) (lp (cdr l)))
 668: 3* [ly:load "define-event-classes.scm"]
In 
/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/lily.scm:
 109: 4  (let (#) (if # #) (if # #) ...)
 114: 5* [primitive-load 
"/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilyp$
In 
/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/define-event-classes.scm: 

  44: 6* (define ancestor-lookup (make-hash-table))
  44: 7* (make-hash-table)

/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/define-event-classes.scm:44:25: 
In expression (make-hash-table):
/usr/home/gperciva/usr/src/lilypond/out/bin/../share/lilypond/2.9.15/scm/define-event-classes.scm:44:25: 
Wrong number of arguments to #<procedure make-hash-table (k)>
gmake[2]: *** [out/lilypond-internals.texi] Error 2