diff --git a/packages/unstrctrd/unstrctrd.0.4/opam b/packages/unstrctrd/unstrctrd.0.4/opam
new file mode 100644
index 00000000000..145ecb77dfc
--- /dev/null
+++ b/packages/unstrctrd/unstrctrd.0.4/opam
@@ -0,0 +1,36 @@
+opam-version: "2.0"
+synopsis: "Fast and compliant Unstructured parser according RFC 822"
+description: """Unstrctrd is a library for managing values formatted according to \
+the unstructured rule introduced by RFC 822. This format can be found in emails, \
+HTTP/1.1 and also in the description of Debian packages."""
+maintainer: "Romain Calascibetta <romain.calascibetta@gmail.com>"
+authors: "Romain Calascibetta <romain.calascibetta@gmail.com>"
+license: "MIT"
+homepage: "https://github.com/dinosaure/unstrctrd"
+doc: "https://dinosaure.github.io/unstrctrd/"
+bug-reports: "https://github.com/dinosaure/unstrctrd/issues"
+depends: [
+  "ocaml" {>= "4.07.0"}
+  "dune" {>= "2.0"}
+  "uutf"
+  "angstrom" {>= "0.14.0"}
+  "rresult" {with-test}
+  "alcotest" {with-test}
+  "ke" {with-test}
+  "bigstringaf" {with-test}
+  "hxd" {with-test & >= "0.3.1"}
+  "fmt" {with-test & >= "0.8.7"}
+  "crowbar" {>= "0.2" & with-test}
+]
+build: ["dune" "build" "-p" name "-j" jobs]
+run-test: ["dune" "runtest" "-p" name "-j" jobs]
+dev-repo: "git+https://github.com/dinosaure/unstrctrd.git"
+url {
+  src:
+    "https://github.com/dinosaure/unstrctrd/releases/download/v0.4/unstrctrd-0.4.tbz"
+  checksum: [
+    "sha256=368a9b86acea988e952fe7bdf5db2c9eaf5345a6939e609351f15eeb25121824"
+    "sha512=94f68b5e1e9ae9c65ba3e4cb3e673d730a7fe9c4a2155f65373385d56a2eb0587657b73cea854f3cd44a020f67f391fe2cf0d6691f813b2fc093fd6ca64d1307"
+  ]
+}
+x-commit-hash: "ae573deee696e3927dc06d9b27ed2139931d2c58"