9999-ebuild created but not tested.

pkgs/gentoo/snail-1.2.6.ebuild

@@ -3,16 +3,24 @@
 # $Header: $
 
 EAPI=4
+
 inherit eutils
 
+if [[ ${PV} == "9999" ]] ; then
+	EGIT_REPO_URI=${EGIT_REPO_URI:-"git://github.com/backbone/snail.git"}
+	inherit git-2
+	KEYWORDS=""
+else
+	SRC_URI="ftp://backbone.ws/projects/snail/${P}.tar.bz2"
+	KEYWORDS="-* ~x86 ~amd64"
+fi
+
 DESCRIPTION="Snail - nVidia Optimus support"
 
 SRC_URI="ftp://backbone.ws/projects/snail/${P}.tar.bz2"
 
 HOMEPAGE="https://chili.backbone.ws/projects/snail"
 
-KEYWORDS="-* ~x86 ~amd64"
-
 SLOT="0"
 
 LICENSE="GPL-3"
@@ -25,11 +33,21 @@ DEPEND="x11-drivers/nvidia-drivers
 
 RDEPEND="${DEPEND}"
 
+src_prepare() {
+	if [[ ${PV} == "9999" ]] ; then
+		# Allow user patches to be applied without modifying the ebuild
+		epatch_user
+	fi
+}
+
 src_install() {
-	emake install DESTDIR="${D}" || die
+	if [[ ${PV} == "9999" ]] ; then
+		emake install DESTDIR="${D}"
+	else
+		emake install DESTDIR="${D}" || die
+	fi
 }
 
 pkg_postinst() {
 	snail.configure
 }
-

pkgs/gentoo/snail-9999.ebuild

@@ -0,0 +1,53 @@
+# Copyright 1999-2011 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+EAPI=4
+
+inherit eutils
+
+if [[ ${PV} == "9999" ]] ; then
+	EGIT_REPO_URI=${EGIT_REPO_URI:-"git://github.com/backbone/snail.git"}
+	inherit git-2
+	KEYWORDS=""
+else
+	SRC_URI="ftp://backbone.ws/projects/snail/${P}.tar.bz2"
+	KEYWORDS="-* ~x86 ~amd64"
+fi
+
+DESCRIPTION="Snail - nVidia Optimus support"
+
+SRC_URI="ftp://backbone.ws/projects/snail/${P}.tar.bz2"
+
+HOMEPAGE="https://chili.backbone.ws/projects/snail"
+
+SLOT="0"
+
+LICENSE="GPL-3"
+
+IUSE=""
+
+DEPEND="x11-drivers/nvidia-drivers
+        sys-power/bbswitch
+        sys-apps/dmidecode"
+
+RDEPEND="${DEPEND}"
+
+src_prepare() {
+	if [[ ${PV} == "9999" ]] ; then
+		# Allow user patches to be applied without modifying the ebuild
+		epatch_user
+	fi
+}
+
+src_install() {
+	if [[ ${PV} == "9999" ]] ; then
+		emake install DESTDIR="${D}"
+	else
+		emake install DESTDIR="${D}" || die
+	fi
+}
+
+pkg_postinst() {
+	snail.configure
+}