diff --git a/dev-dotnet/gtk-sharp/Manifest b/dev-dotnet/gtk-sharp/Manifest
new file mode 100644
index 0000000000..734e9237de
--- /dev/null
+++ b/dev-dotnet/gtk-sharp/Manifest
@@ -0,0 +1 @@
+DIST gtk-sharp-2.99.3.zip 3967326 BLAKE2B 0ecacd0460256adbb03e9578946362560648fce6ca6fe402b97b53d34efae476e9a1c02f6d00245fc854694ddfe3e613f04e56f9b07e8ceda1fc01f4c351d663 SHA512 2c149456f9beaf41a7d9e47c3a3720fc71484ad18842ffba4c95bb904dc1c53932fbdfd2eba8820c668947b8d4599dd3b5ce73b2584c1194c4dab8991a55c18a
diff --git a/dev-dotnet/gtk-sharp/files/gtk-sharp-2.99.3-fix-build.patch b/dev-dotnet/gtk-sharp/files/gtk-sharp-2.99.3-fix-build.patch
new file mode 100644
index 0000000000..6db28b7a6f
--- /dev/null
+++ b/dev-dotnet/gtk-sharp/files/gtk-sharp-2.99.3-fix-build.patch
@@ -0,0 +1,22 @@
+diff a/gtk/gui-thread-check/profiler/gui-thread-check.c b/gtk/gui-thread-check/profiler/gui-thread-check.c
+--- a/gtk/gui-thread-check/profiler/gui-thread-check.c
++++ b/gtk/gui-thread-check/profiler/gui-thread-check.c
+@@ -93,5 +93,5 @@
+ 	
+ 	mono_profiler_install (NULL, NULL);
+ 	mono_profiler_install_enter_leave (simple_method_enter, NULL);
+-	mono_profiler_set_events (MONO_PROFILE_ENTER_LEAVE);
++	mono_profiler_set_events (1 << 12);
+ }
+diff --git a/sample/test/TestRange.cs b/sample/test/TestRange.cs
+index 35fc8a6dd..d44a77d85 100644
+--- a/sample/test/TestRange.cs
++++ b/sample/test/TestRange.cs
+@@ -9,5 +9,7 @@
+ using System;
+ 
+ using Gtk;
++// disambiguate, Gtk.Range vs System.Range
++using Range=Gtk.Range;
+ 
+ namespace WidgetViewer {
diff --git a/dev-dotnet/gtk-sharp/gtk-sharp-2.99.3-r2.ebuild b/dev-dotnet/gtk-sharp/gtk-sharp-2.99.3-r2.ebuild
new file mode 100644
index 0000000000..5365f3dfb2
--- /dev/null
+++ b/dev-dotnet/gtk-sharp/gtk-sharp-2.99.3-r2.ebuild
@@ -0,0 +1,65 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit dotnet autotools
+
+SLOT="3"
+DESCRIPTION="gtk bindings for mono"
+LICENSE="GPL-2"
+HOMEPAGE="https://www.mono-project.com/GtkSharp"
+KEYWORDS="~amd64 ~ppc ~x86"
+SRC_URI="https://github.com/mono/${PN}/archive/${PV}.zip -> ${P}.zip"
+IUSE="debug"
+PATCHES=( "${FILESDIR}/${P}-fix-build.patch" )
+
+RESTRICT="test"
+
+RDEPEND="
+	>=dev-lang/mono-3.0
+	x11-libs/pango
+	>=dev-libs/glib-2.31
+	dev-libs/atk
+	x11-libs/gtk+:3
+	gnome-base/libglade
+	dev-perl/XML-LibXML
+	!dev-dotnet/gtk-sharp-gapi
+	!dev-dotnet/gtk-sharp-docs
+	!dev-dotnet/gtk-dotnet-sharp
+	!dev-dotnet/gdk-sharp
+	!dev-dotnet/glib-sharp
+	!dev-dotnet/glade-sharp
+	!dev-dotnet/pango-sharp
+	!dev-dotnet/atk-sharp"
+DEPEND="${RDEPEND}
+	virtual/pkgconfig
+	sys-devel/automake:1.11"
+
+src_prepare() {
+	base_src_prepare
+	eautoreconf
+	libtoolize
+	eapply "${FILESDIR}/${P}-fix-build.patch"
+	eapply_user
+}
+
+src_configure() {
+	econf	CSC=/usr/bin/mcs
+		--disable-static \
+		--disable-dependency-tracking \
+		--disable-maintainer-mode \
+		$(use_enable debug)
+}
+
+src_compile() {
+	emake CSC=/usr/bin/mcs
+}
+
+src_install() {
+	default
+	dotnet_multilib_comply
+	sed -i "s/\\r//g" "${D}"/usr/bin/* || die "sed failed"
+	insinto /usr/lib64/
+	dosym gapi-3.0 /usr/lib/gapi-3.0
+}