Freecell will not launch

[Partha Bagchi <partha partha com>]

sol --variation freecell
Backtrace:
In /usr/share/sol-games/freecell.scm:
581: 0* (define kill-thread-mutex (make-mutex))
581: 1* (make-mutex)

/usr/share/sol-games/freecell.scm:581:27: In expression (make-mutex):
/usr/share/sol-games/freecell.scm:581:27: Unbound variable: make-mutex