Apologies for reviving an old topic.  There was no resolution posted, 
and the same problem is happening today with guile-1.8.7 on Solaris-10 
x86 platform, compiling with Sun Studio 12, all patches current as of
early March-2010.

The earlier response, archived here, gave a clue to solution:
   http://lists.gnu.org/archive/html/bug-guile/2009-03/msg00009.html

I was able to get past the problem by updating gc_os_dep.c's "#ifdef 
SUNOS5" sections with the same sections lifted out of a more recent
Boehme GC release (gc-6.8), file gcconfig.h.

Regards,

Marion