[plt-scheme] Latest SVN 3216, unable to build

Get this during make:
make[4]: Entering directory `/home/pmatos/plt-build/mzscheme/gc2'
../mzscheme -rq /usr/local/plt/plt/src/mzscheme/gc2/xform.ss --setup
--cpp "gcc -E -DNEWGC_BTC_ACCOUNT  -I./..
-I/usr/local/plt/plt/src/mzscheme/gc2/../include" -o xsrc/salloc.c
/usr/local/plt/plt/src/mzscheme/gc2/../src/salloc.c
Copying tree...
/usr/local/plt/plt/collects/net/url-unit.ss:352:51: read: bad regexp
string: extra closing parenthesis in pattern
make[4]: *** [xsrc/salloc.c] Error 1
make[4]: Leaving directory `/home/pmatos/plt-build/mzscheme/gc2'

It seems to be in:
...
(let ([m (regexp-match-peek-positions
#rx"^HTTP/.*?((\r\n\r\n)|(\n\n)|(\r\r))" port)])
...

still I can't figure out what the problem might be but yet again, I
don't know much about regexp.

Cheers,
-- 
Paulo Jorge Matos - pocm at sat inesc-id pt
Web: http://sat.inesc-id.pt/~pocm
Computer and Software Engineering
INESC-ID - SAT Group