These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild N ] x11-wm/compiz-9999 USE="dbus fuse kde svg -gnome -gtk" 0 kB [1]
[ebuild N ] x11-libs/compiz-bcop-9999 0 kB [1]
[ebuild N ] x11-wm/emerald-9999 0 kB [1]
[ebuild N ] x11-libs/libcompizconfig-9999 0 kB [1]
[ebuild N ] x11-plugins/compiz-fusion-plugins-main-9999 0 kB [1]
[ebuild N ] x11-libs/compizconfig-backend-kconfig-9999 USE="arts xinerama -debug" 0 kB [1]
[ebuild N ] x11-plugins/compiz-fusion-plugins-extra-9999 0 kB [1]
[ebuild N ] dev-python/compizconfig-python-9999 0 kB [1]
[ebuild N ] x11-themes/emerald-themes-9999 0 kB [1]
[ebuild N ] x11-apps/ccsm-9999 0 kB [1]
[ebuild N ] x11-wm/compiz-fusion-9999 USE="kde -gnome" 0 kB [1]
Total: 11 packages (11 new), Size of downloads: 0 kB
Portage overlays:
[1] /usr/portage/local/layman/xeffects
Would you like to merge these packages? [Yes/No] yes
>>> Verifying ebuild Manifests...
>>> starting parallel fetching
>>> Emerging (1 of 11) x11-wm/compiz-9999 to /
* checking ebuild checksums ;-) ... [ ok ]
* checking auxfile checksums ;-) ... [ ok ]
* checking miscfile checksums ;-) ... [ ok ]
* Compiz now requires libX11 to be built with xcb.
* Please build libX11 with USE="xcb"
!!! ERROR: x11-wm/compiz-9999 failed.
Call stack:
ebuild.sh, line 1637: Called dyn_setup
ebuild.sh, line 704: Called qa_call 'pkg_setup'
ebuild.sh, line 44: Called pkg_setup
compiz-9999.ebuild, line 47: Called die
!!! Build libX11 with USE="xcb"
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/x11-wm/compiz-9999/temp/build.log'.
!!! This ebuild is from an overlay: '/usr/portage/local/layman/xeffects'