diff --git a/dev-ml/diet/Manifest b/dev-ml/diet/Manifest
new file mode 100644
index 0000000000..58c0bcc7d7
--- /dev/null
+++ b/dev-ml/diet/Manifest
@@ -0,0 +1 @@
+DIST diet-0.4.tar.gz 10139 BLAKE2B df7e3a06f90ced220a2fecff71c0c0c1d61a3bf6bd27cff80712a41e81bd6db4f7afc385cb0ce20d0077831975dd8c7d3d0888fcb9dd9809bdf9478c08ad2d7d SHA512 a8e122ddd343f6d9130169e1b066578f555d7eb2f0795a4603ba6ee6a31ad1ed2a1cc0a3149ac90d3995a7d8f5e770c56d9002160fa01b35bc16d10b9536ce97
diff --git a/dev-ml/diet/diet-0.4.ebuild b/dev-ml/diet/diet-0.4.ebuild
new file mode 100644
index 0000000000..aece1850fc
--- /dev/null
+++ b/dev-ml/diet/diet-0.4.ebuild
@@ -0,0 +1,26 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit dune
+
+MYPN="ocaml-${PN}"
+
+DESCRIPTION="A simple implementation of Discrete Interval Encoding Trees"
+HOMEPAGE="https://github.com/mirage/ocaml-diet"
+SRC_URI="https://github.com/mirage/${MYPN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+S="${WORKDIR}/${MYPN}-${PV}"
+
+LICENSE="ISC"
+SLOT="0/${PV}"
+KEYWORDS="~amd64"
+IUSE="ocamlopt test"
+
+RDEPEND="dev-ml/stdlib-shims"
+DEPEND="
+	${RDEPEND}
+	test? ( dev-ml/ounit )
+"
+
+RESTRICT="!test? ( test )"
diff --git a/dev-ml/diet/metadata.xml b/dev-ml/diet/metadata.xml
new file mode 100644
index 0000000000..836835d2fd
--- /dev/null
+++ b/dev-ml/diet/metadata.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <maintainer type="person">
+    <email>lssndrbarbieri@gmail.com</email>
+    <name>Alessandro Barbieri</name>
+  </maintainer>
+  <upstream>
+    <remote-id type="github">mirage/ocaml-diet</remote-id>
+  </upstream>
+</pkgmetadata>