feh 2.12 has giblib listed as a dependency in its ebuild, but it is no longer needed according to the 2.12 changelog. Here's the excerpt in question, located at http://feh.finalrewind.org/: "feh no longer depends on giblib. Instead, the relevant parts of the giblib source were imported into the feh source. Rationale: giblib is unmaintained and, as far as I know, only used by three projects (one of which is feh). There is at least one known bug in it, and as I do not have the time to take over giblib development, importing the library seems to be the best solution." Just to make sure I downloaded the archive under the release announcement, and surely enough it seems to build & run fine with no giblib installed on my system.
*Just to make sure, I downloaded[...] That should be clearer.
It should be fixed now
