On the Debian SPARC64 port the sumset test fails with SIGBUS with the following circumstances:

0x0000010000002344 in rs_block_sig_init (sig=0x1000010815a, weak_sum=463471464, strong_sum=0x7fefffff0e8, strong_len=6) at ./src/sumset.c:41
41          sig->weak_sum = weak_sum;

As you can see, sig is not aligned on 4 while sig->weak_sum has size 4. Looks like it's because block_sigs is an unpadded array of structures of size 6.