[racket] Recent GIT HEAD Breakage On Linux

Hi,

Recently (1-2 weeks?) GIT HEAD stopped working for me with the following
error.  This happens in DrRacket when I attempt to use the REPL (hit the
Run button, get the prompt, enter anything <rtn>, and BORK!! as below).
 Everything else in DrRacket is flawless, editing, TypedRacket performance,
check syntax etc.

This is on a Linux, Fedora 16 64 bit.  Racket is built fresh after a git
clean -fdx.

[ray at ray pgm]$ racket/gui/base is not available

 === context ===
/usr/local/racket/collects/racket/sandbox.rkt:94:0: sandbox-make-namespace
/usr/local/racket/collects/racket/sandbox.rkt:430:0:
make-evaluation-namespace
/usr/local/racket/collects/racket/sandbox.rkt:672:0: make-evaluator*
/usr/local/racket/collects/drracket/private/module-language.rkt:105:6:
init-sandbox
/usr/local/racket/collects/drracket/private/module-language.rkt:92:6:
get-language-info method in .../module-language.rkt:88:4
/usr/local/racket/collects/drracket/private/rep.rkt:924:6: submit-to-port?
method in ...cket/private/rep.rkt:389:4
/usr/local/racket/collects/framework/private/text.rkt:2166:4: on-local-char
method in ...ork/private/text.rkt:2002:2
/usr/local/racket/collects/mred/private/wxme/editor-canvas.rkt:446:2:
on-char method in editor-canvas%
/usr/local/racket/collects/racket/private/more-scheme.rkt:151:2:
call-with-break-parameterization
/usr/local/racket/collects/racket/private/more-scheme.rkt:268:2:
call-with-exception-handler
/usr/local/racket/collects/mred/private/wx/gtk/window.rkt:631:4:
dispatch-on-char method in window%
/usr/local/racket/collects/mred/private/wx/common/queue.rkt:445:6
/usr/local/racket/collects/mred/private/wx/common/queue.rkt:485:32
/usr/local/racket/collects/mred/private/wx/common/queue.rkt:633:3

channel-put: expected argument of type <channel>; given: #f

 === context ===
/usr/local/racket/collects/racket/private/misc.rkt:168:2: channel-put
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