Description of problem:
[This is not a bug in iwhd.  I expect to close it NOTABUG or to reassign it. ]
Building for i386, you get a link failure:

...replica.c:445: undefined reference to `__sync_fetch_and_add_4'

The solution is not to build for i386, since it lacks the atomic
built-in functions.  Use -march=i486 or greater instead.

How reproducible: every time.

Steps to Reproduce:
1. build with arch of i386
2.
3.

Actual results:
link failure, as above

Expected results:
successful build

Additional info:
  It seems this is a FAQ:
  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43980