media-libs/ilmbase-1.0.2 was released on 2010-07-23. media-libs/openexr-1.7.0 was released on 2010-07-23. media-gfx/openexr_viewers-1.0.2 was released on 2010-07-23.
Should be done, but it still failed to build with gcc43 so had to add <cstring> to few places... Let's hope I didn't miss any -> Works for me with gcc-4.5.0.