diff --git a/packages/gen_js_api/gen_js_api.1.1.3/opam b/packages/gen_js_api/gen_js_api.1.1.3/opam
new file mode 100644
index 00000000000..bda8628ecc0
--- /dev/null
+++ b/packages/gen_js_api/gen_js_api.1.1.3/opam
@@ -0,0 +1,54 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "Easy OCaml bindings for JavaScript libraries"
+description: """
+
+gen_js_api aims at simplifying the creation of OCaml bindings for
+JavaScript libraries.  Authors of bindings write OCaml signatures for
+JavaScript libraries and the tool generates the actual binding code
+with a combination of implicit conventions and explicit annotations.
+
+gen_js_api is to be used with the js_of_ocaml compiler.
+ """
+maintainer: ["Alain Frisch <alain.frisch@lexifi.com>"]
+authors: [
+  "Alain Frisch <alain.frisch@lexifi.com>"
+  "Sebastien Briais <sebastien.briais@lexifi.com>"
+]
+license: "MIT"
+homepage: "https://github.com/LexiFi/gen_js_api"
+bug-reports: "https://github.com/LexiFi/gen_js_api/issues"
+depends: [
+  "dune" {>= "2.7"}
+  "ocaml" {>= "4.08"}
+  "ppxlib" {>= "0.26"}
+  "js_of_ocaml-compiler" {with-test}
+  "conf-npm" {with-test}
+  "ojs" {= version}
+  "odoc" {with-doc}
+]
+conflicts: [
+  "js_of_ocaml-compiler" {< "4.0.0"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/LexiFi/gen_js_api.git"
+url {
+  src: "https://github.com/LexiFi/gen_js_api/archive/refs/tags/v1.1.3.tar.gz"
+  checksum: [
+    "md5=67ea794b7b15b3744b8657f70f62347a"
+    "sha512=c362db85c86e77f470de2161d6de3563197cbd192846423d83b0c8fa55ec8a6fefcb49a8d3f3bb93b6af0a8d6d6cd50fdcb596cc56791c8d6cdf45d957ec228c"
+  ]
+}
diff --git a/packages/ojs/ojs.1.1.3/opam b/packages/ojs/ojs.1.1.3/opam
new file mode 100644
index 00000000000..099ec4e7220
--- /dev/null
+++ b/packages/ojs/ojs.1.1.3/opam
@@ -0,0 +1,30 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "Runtime Library for gen_js_api generated libraries"
+description: "To be used in conjunction with gen_js_api"
+maintainer: ["Alain Frisch <alain.frisch@lexifi.com>"]
+authors: [
+  "Alain Frisch <alain.frisch@lexifi.com>"
+  "Sebastien Briais <sebastien.briais@lexifi.com>"
+]
+license: "MIT"
+homepage: "https://github.com/LexiFi/gen_js_api"
+bug-reports: "https://github.com/LexiFi/gen_js_api/issues"
+depends: [
+  "dune" {>= "2.7"}
+  "ocaml" {>= "4.08"}
+  "js_of_ocaml-compiler" {>= "4.0.0"}
+  "odoc" {with-doc}
+]
+dev-repo: "git+https://github.com/LexiFi/gen_js_api.git"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs "@install" "@doc" {with-doc}]
+]
+url {
+  src: "https://github.com/LexiFi/gen_js_api/archive/refs/tags/v1.1.3.tar.gz"
+  checksum: [
+    "md5=67ea794b7b15b3744b8657f70f62347a"
+    "sha512=c362db85c86e77f470de2161d6de3563197cbd192846423d83b0c8fa55ec8a6fefcb49a8d3f3bb93b6af0a8d6d6cd50fdcb596cc56791c8d6cdf45d957ec228c"
+  ]
+}