This was requested and I tested it and it works - needs two files galaxium and libanculus-sharp - bugs.gentoo.org has the ebuilds but they are old and missing ~amd64 http://bugs.gentoo.org/show_bug.cgi?id=229645 so I have updated the ebuilds below: 

galaxium-0.7.3.ebuild
# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

inherit mono autotools

DESCRIPTION="An instant messenger application designed for the GNOME desktop"
HOMEPAGE="http://code.google.com/p/galaxium/"
SRC_URI="http://galaxium.googlecode.com/files/${PN}_${PV}.tar.gz"

LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~x86 ~amd64"
IUSE=""

DEPEND=">=dev-dotnet/mono-addins-0.3
	>=dev-lang/mono-1.2.4
	>=dev-dotnet/gtk-sharp-2.10.2
	>=dev-dotnet/glade-sharp-2.10.0
	>=dev-dotnet/gecko-sharp-0.10
	>=dev-dotnet/dbus-sharp-0.4.2
	>=dev-dotnet/dbus-glib-sharp-0.3
	>=media-libs/gstreamer-0.10
	>=dev-dotnet/libanculus-sharp-0.3"
	#>=dev-dotnet/webkit-sharp-0.2 # Not yet in portage
RDEPEND="${DEPEND}"

src_unpack() {
	unpack ${A}
	cd "${S}"
	eautoreconf
}

src_compile() {
	econf --disable-webkit --enable-gecko || die "configure failed"
	emake || die "make failed"
}

src_install() {
	make DESTDIR="${D}" install || die "install failed"
}


-----------------------------------------------------------------------------------------------


libanculus-sharp-0.3.1.ebuild
# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

inherit mono autotools

DESCRIPTION="A reusable utility library written in C#"
HOMEPAGE="http://code.google.com/p/libanculus-sharp/"
SRC_URI="http://libanculus-sharp.googlecode.com/files/${P}.tar.bz2"

LICENSE="MIT"
SLOT="0"
KEYWORDS="~x86 ~amd64"
IUSE=""

DEPEND=">=dev-lang/mono-1.2.3
	>=dev-dotnet/gtk-sharp-2.8.0"
RDEPEND="${DEPEND}"

src_unpack() {
	unpack ${A}
	cd "${S}"
	eautoreconf
}

src_install() {
	make DESTDIR="${D}" install || die "install failed"
}