When building --with-guile=2.0, trying to make the first move in a freecell game generates an exception:

Backtrace:
In ice-9/boot-9.scm:
 170: 11 [catch #t #<catch-closure 82967a0> ...]
In unknown file:
   ?: 10 [catch-closure]
In ice-9/boot-9.scm:
 170: 9 [catch #t #<catch-closure 8a09ec0> ...]
In unknown file:
   ?: 8 [catch-closure]
In ice-9/eval.scm:
 362: 7 [eval # #]
 350: 6 [eval # #]
 350: 5 [eval # #]
 349: 4 [eval # #]
 356: 3 [eval #<memoized $expt> (10 (#) 11 . #<directory # 81fb828>)]
In unknown file:
   ?: 2 [memoize-variable-access! #<memoized $expt> #<directory # 81fb828>]
In ice-9/boot-9.scm:
 115: 1 [#<procedure 898bb90 at ice-9/boot-9.scm:110:6 (thrown-k . args)> unbound-variable ...]
In unknown file:
   ?: 0 [catch-closure unbound-variable #f "Unbound variable: ~S" ($expt) #f]

(gdb) where

+ Trace 227043