The prototype for sigsetjmp in pthread.h is broken in some glibc versions, as in https://bugzilla.redhat.com/show_bug.cgi?id=857236, comment 1. AFAICS, current stable glibc 2.15-r3 and 2.16 are affected. It looks fixed in 2.17, no idea about other glibc versions.
yes, it seems to be fixed in 2.17. that's the next version slated for stable, so i don't see anything that needs to be done here.