>>> Emerging (1 of 218) x11-libs/gtk+-2.10.6 to /
 * gtk+-2.10.6.tar.bz2 MD5 ;-) ...                                                                                                                     [ ok ]
 * gtk+-2.10.6.tar.bz2 RMD160 ;-) ...                                                                                                                  [ ok ]
 * gtk+-2.10.6.tar.bz2 SHA1 ;-) ...                                                                                                                    [ ok ]
 * gtk+-2.10.6.tar.bz2 SHA256 ;-) ...                                                                                                                  [ ok ]
 * gtk+-2.10.6.tar.bz2 size ;-) ...                                                                                                                    [ ok ]
 * checking ebuild checksums ;-) ...                                                                                                                   [ ok ]
 * checking auxfile checksums ;-) ...                                                                                                                  [ ok ]
 * checking miscfile checksums ;-) ...                                                                                                                 [ ok ]
 * checking gtk+-2.10.6.tar.bz2 ;-) ...                                                                                                                [ ok ]
 * Please re-emerge x11-libs/cairo with the X and pdf USE flag set

!!! ERROR: x11-libs/gtk+-2.10.6 failed.
Call stack:
  ebuild.sh, line 1562:   Called dyn_setup
  ebuild.sh, line 665:   Called pkg_setup
  gtk+-2.10.6.ebuild, line 53:   Called die

!!! cairo needs the X and pdf flag set
!!! If you need support, post the topmost build error, and the call stack if relevant.