guile stable-2.0 fails on OSX 10.6.7

[Leo]

I can not build the stable-2.0 branch of today on OSX 10.6.7.

I have all the required libraries installed and was able to build my
current guile: GNU Guile 1.9.13.94-a653d-dirty.

......
/usr/local/unix/libunistring/include/unistring/stdint.h:3:5: warning: 
"__GLIBC__" is not defined
  CC     libguile_2.0_la-trees.lo
  CC     libguile_2.0_la-uniform.lo
  CC     libguile_2.0_la-values.lo
  CC     libguile_2.0_la-variable.lo
  CC     libguile_2.0_la-vectors.lo
  CC     libguile_2.0_la-version.lo
  CC     libguile_2.0_la-vm.lo
  CC     libguile_2.0_la-vports.lo
  CC     libguile_2.0_la-weaks.lo
  CCLD   libguile-2.0.la
Undefined symbols:
  "_GC_pthread_sigmask", referenced from:
      _signal_delivery_thread in libguile_2.0_la-scmsigs.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[3]: *** [libguile-2.0.la] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

This irc log might be of use too:
http://paste.pocoo.org/show/Krz5amnXlilJ368ACaxa/

Thanks.
Leo