media-libs/jpeg-mmx-1.1.2 does not exist anymore (it was a typo), and now, latest version available is media-libs/jpeg-mmx-0.1.6. So now, media-gfx/showimg should depend on >=media-libs/jpeg-mmx-0.1.6. Bug #100565 shows the same issue for media-video/mjpegtools.
*** This bug has been marked as a duplicate of 100570 ***