hunspell-de build problem: new sed core dump

[Thomas Klausner <wiz%NetBSD.org@localhost>]

after updating my -current to a snapshot from Nov 6, I see a new build failure 
in hunspell-de:

sed: stdout: Broken pipe
+ sed 's:--x::'
+ grep -- --x 'hunspell-capmain-plus_de_CH.tmp.tmp'
+ echo
+ exit 0
[1]   Done                    ./bin/hunspell-c... |
      Segmentation fault (core dumped) sed -f ./bin/iso...
gmake: *** [hunspell-capmain-plus_de_CH.tmp] Error 139
*** Error code 2

Stop.
make: stopped in /usr/pkgsrc/textproc/hunspell-de
*** Error code 1

sed dumps core.

The backtrace looks like this:
[New process 1]
Core was generated by `sed'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f7ff744960e in isinsets (c=<optimized out>, g=0x7f7ff7b14840) at 
/archive/cvs/src/lib/libc/regex/regcomp.c:1568
1568    /archive/cvs/src/lib/libc/regex/regcomp.c: No such file or directory.
        in /archive/cvs/src/lib/libc/regex/regcomp.c
(gdb) bt
#0  0x00007f7ff744960e in isinsets (c=<optimized out>, g=0x7f7ff7b14840) at 
/archive/cvs/src/lib/libc/regex/regcomp.c:1568
#1  categorize (g=0x7f7ff7b14840, p=<optimized out>) at 
/archive/cvs/src/lib/libc/regex/regcomp.c:1623
#2  _regcomp (preg=0x7f7ff7b01100, pattern=<optimized out>, cflags=<optimized 
out>) at /archive/cvs/src/lib/libc/regex/regcomp.c:316
#3  0x0000000000401a56 in compile_re (p=0x7f7ff7b06804 "u\"/g\n", 
repp=0x7f7ff7b10198) at /archive/cvs/src/usr.bin/sed/compile.c:473
#4  0x00000000004022e8 in compile_stream (link=<optimized out>) at 
/archive/cvs/src/usr.bin/sed/compile.c:351
#5  compile () at /archive/cvs/src/usr.bin/sed/compile.c:179
#6  0x0000000000402cc3 in main (argc=<optimized out>, argv=0x7f7fffffcf40) at 
/archive/cvs/src/usr.bin/sed/main.c:190


Ideas?
 Thomas