diff --git a/dev-libs/tweeny/Manifest b/dev-libs/tweeny/Manifest
new file mode 100644
index 0000000000..f11cb8539f
--- /dev/null
+++ b/dev-libs/tweeny/Manifest
@@ -0,0 +1 @@
+DIST tweeny-3.1.0.tar.gz 49467 BLAKE2B 7b1a3b7a7dba22d291c89dc3b2ee07458070aa55f2e77adfc1f0de4095187d2a2e0e0960a17a17fd96cccdd114d42d5e1bb4a6a76edc4b97500b2615c0eb574e SHA512 8109c241f866b565d15f1f5f87837f178a4fd3c5169d73e73e18334c54274024b48c9baed1f1935201ab872687bacb9ff3f8ecbae8078de4e1b459242450b9a5
diff --git a/dev-libs/tweeny/metadata.xml b/dev-libs/tweeny/metadata.xml
new file mode 100644
index 0000000000..04b071e1b7
--- /dev/null
+++ b/dev-libs/tweeny/metadata.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>gentoo@tastytea.de</email>
+		<name>Ronny (tastytea) Gutbrod</name>
+	</maintainer>
+	<longdescription lang="en">
+		Tweeny is an inbetweening library designed for the creation of complex
+		animations for games and other beautiful interactive software. It
+		leverages features of modern C++ to empower developers with an intuitive
+		API for declaring tweenings of any type of value, as long as they
+		support arithmetic operations.
+	</longdescription>
+	<upstream>
+		<remote-id type="github">mobius3/tweeny</remote-id>
+	</upstream>
+</pkgmetadata>
diff --git a/dev-libs/tweeny/tweeny-3.1.0.ebuild b/dev-libs/tweeny/tweeny-3.1.0.ebuild
new file mode 100644
index 0000000000..e36d70c222
--- /dev/null
+++ b/dev-libs/tweeny/tweeny-3.1.0.ebuild
@@ -0,0 +1,37 @@
+# Copyright 2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="C++ tweening (inbetweening) library"
+HOMEPAGE="https://mobius3.github.io/tweeny/"
+SRC_URI="https://github.com/mobius3/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="doc"
+
+RDEPEND=""
+DEPEND="${RDEPEND}"
+
+src_prepare() {
+	cmake_src_prepare
+
+	if use doc; then
+		sed -i "s@DESTINATION share/doc/Tweeny@DESTINATION share/doc/${PF}@" \
+			doc/CMakeLists.txt || die "Could not change documentation path."
+	fi
+}
+
+src_configure() {
+	local -a mycmakeargs=(
+		-DTWEENY_BUILD_EXAMPLES=NO
+		-DTWEENY_BUILD_DOCUMENTATION=$(usex doc)
+		-DTWEENY_BUILD_EXTRAS=NO
+	)
+
+	cmake_src_configure
+}