So I'd likely be seeing the same problem as you using boost, as
the
later 686 build is missing.
But it definitely exists, e.g.
http://mirror.bytemark.co.uk/fedora/linux/updates/18/i386/boost-build-1.5...
or for your case
http://mirror.bytemark.co.uk/fedora/linux/updates/19/i386/boost-1.53.0-8....
so it's some kind of repository metadata issue, not sure where to file
a bug for that. Might be worth a post to the devel list.
Amazingly in both cases I copied the link to the wrong package. Time
to call it a day I think...