scotty@borgcube ~ $ sudo emerge -uav kaffeine

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] media-video/kaffeine-0.8.3 [0.8.2-r1] USE="arts dvb encode gstreamer kdehiddenvisibility vorbis xinerama -debug" 0 kB 

Total: 1 package (1 upgrade), Size of downloads: 0 kB

Would you like to merge these packages? [Yes/No] y

>>> Emerging (1 of 1) media-video/kaffeine-0.8.3 to /
 * kaffeine-0.8.3.tar.bz2 MD5 ;-) ...                                                                              [ ok ]
 * kaffeine-0.8.3.tar.bz2 RMD160 ;-) ...                                                                           [ ok ]
 * kaffeine-0.8.3.tar.bz2 SHA1 ;-) ...                                                                             [ ok ]
 * kaffeine-0.8.3.tar.bz2 SHA256 ;-) ...                                                                           [ ok ]
 * kaffeine-0.8.3.tar.bz2 size ;-) ...                                                                             [ ok ]
 * checking ebuild checksums ;-) ...                                                                               [ ok ]
 * checking auxfile checksums ;-) ...                                                                              [ ok ]
 * checking miscfile checksums ;-) ...                                                                             [ ok ]
 * checking kaffeine-0.8.3.tar.bz2 ;-) ...                                                                         [ ok ]
>>> Unpacking source...
>>> Unpacking kaffeine-0.8.3.tar.bz2 to /var/tmp/portage/media-video/kaffeine-0.8.3/work
 * Applying kaffeine-0.8.3-build.patch ...                                                                         [ ok ]
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/media-video/kaffeine-0.8.3/work/kaffeine-0.8.3 ...
 * You asked to enable hidden visibility, but your kdelibs was
 * built without its support. Please rebuild kdelibs with the
 * kdehiddenvisibility useflag enabled.

!!! ERROR: media-video/kaffeine-0.8.3 failed.
Call stack:
  ebuild.sh, line 1580:   Called dyn_compile
  ebuild.sh, line 945:   Called src_compile
  kaffeine-0.8.3.ebuild, line 43:   Called kde_src_compile
  kde.eclass, line 169:   Called kde_src_compile 'all'
  kde.eclass, line 339:   Called kde_src_compile 'myconf' 'configure' 'make'
  kde.eclass, line 277:   Called die

!!! kdelibs without hidden visibility
!!! If you need support, post the topmost build error, and the call stack if relevant.