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

Calculating dependencies ... done!
Dependency resolution took 1.06 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libogg-1.3.6::gentoo  USE="-static-libs" 430 KiB
[ebuild  N     ] acct-group/icecast-0-r2::gentoo  0 KiB
[ebuild  N     ] media-libs/libvorbis-1.3.7-r2::gentoo  USE="-static-libs -test" 1176 KiB
[ebuild  N     ] acct-user/icecast-0-r2::gentoo  0 KiB
[ebuild  N     ] dev-libs/libigloo-0.9.5::gentoo  412 KiB
[ebuild  N     ] media-libs/speex-1.2.1-r2::gentoo  USE="vbr -utils -valgrind" CPU_FLAGS_X86="sse" 1019 KiB
[ebuild  N     ] media-libs/libtheora-1.2.0-r1:0/2::gentoo  USE="encode -doc -examples -static-libs" 1786 KiB
[ebuild  N     ] net-misc/icecast-2.5.0::gentoo  USE="speex ssl theora yp -geoip (-selinux) -test" 1569 KiB

Total: 8 packages (8 new), Size of downloads: 6390 KiB