[plt-scheme] bug in SVN?

Hi

While trying to build the SVN version of MZScheme, I got this error  
several times:

setup-plt:   /Users/filcab/dev/stuff/plt/collects/r5rs/main.ss:22:45:  
module: provided identifier not defined or imported at: transcript-off  
in: (#%module-begin (printing-module-begin (require (for-syntax scheme/ 
base)) (provide (for-syntax syntax-rules ...) (rename-out (mcons cons)  
(mcar car) (mcdr cdr) (set-mcar! set-car!) (set-mcdr! set-cdr!)  
(mpair? pair?) (mmap map) (mfor-each for-each)) = <...


it seems transcript-on is defined in mzlib/transcr.ss but it isn't  
being included. Not knowing enough about how the source code is  
organized, I turn to you for help.

My SVN revision is 8124.

Thanks in advance,

   - Filipe Cabecinhas