diff --git a/packages/core_kernel/core_kernel.113.33.02+4.03/descr b/packages/core_kernel/core_kernel.113.33.02+4.03/descr
new file mode 100644
index 00000000000..c3b5dcc2c89
--- /dev/null
+++ b/packages/core_kernel/core_kernel.113.33.02+4.03/descr
@@ -0,0 +1,6 @@
+Industrial strength alternative to OCaml's standard library
+The Core suite of libraries is an industrial strength alternative to
+OCaml's standard library that was developed by Jane Street, the
+largest industrial user of OCaml.
+
+Core_kernel is the system-independent part of Core.
diff --git a/packages/core_kernel/core_kernel.113.33.02+4.03/opam b/packages/core_kernel/core_kernel.113.33.02+4.03/opam
new file mode 100644
index 00000000000..99ce3ff6fff
--- /dev/null
+++ b/packages/core_kernel/core_kernel.113.33.02+4.03/opam
@@ -0,0 +1,28 @@
+opam-version: "1.2"
+maintainer: "opensource@janestreet.com"
+authors: ["Jane Street Group, LLC <opensource@janestreet.com>"]
+homepage: "https://github.com/janestreet/core_kernel"
+bug-reports: "https://github.com/janestreet/core_kernel/issues"
+dev-repo: "https://github.com/janestreet/core_kernel.git"
+license: "Apache-2.0"
+build: [
+  ["./configure" "--prefix" prefix]
+  [make]
+]
+depends: [
+  "ocamlbuild"      {build}
+  "ocamlfind"       {build & >= "1.3.2"}
+  "bin_prot"        {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "fieldslib"       {>= "113.24.00" & < "113.25.00"}
+  "ppx_assert"      {>= "113.33.00" & < "113.34.00"}
+  "ppx_bench"       {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "ppx_driver"      {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "ppx_expect"      {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "ppx_inline_test" {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "ppx_jane"        {>= "113.33.00" & < "113.34.00"}
+  "result"
+  "sexplib"         {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "typerep"         {>= "113.24.00" & < "113.25.00"}
+  "variantslib"     {>= "113.24.00" & < "113.25.00"}
+]
+available: [ ocaml-version >= "4.04.0" ]
diff --git a/packages/core_kernel/core_kernel.113.33.02+4.03/url b/packages/core_kernel/core_kernel.113.33.02+4.03/url
new file mode 100644
index 00000000000..a1609869bf8
--- /dev/null
+++ b/packages/core_kernel/core_kernel.113.33.02+4.03/url
@@ -0,0 +1,2 @@
+archive: "https://github.com/janestreet/core_kernel/archive/113.33.02+4.03.tar.gz"
+checksum: "2c8b9406fe3b6c5a49c42f8efb806c85"
diff --git a/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/descr b/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/descr
new file mode 100644
index 00000000000..3f971100044
--- /dev/null
+++ b/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/descr
@@ -0,0 +1,2 @@
+Optional compilation for OCaml
+Part of the Jane Street's PPX rewriters collection.
diff --git a/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/opam b/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/opam
new file mode 100644
index 00000000000..ba066fc2199
--- /dev/null
+++ b/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/opam
@@ -0,0 +1,18 @@
+opam-version: "1.2"
+maintainer: "opensource@janestreet.com"
+authors: ["Jane Street Group, LLC <opensource@janestreet.com>"]
+homepage: "https://github.com/janestreet/ppx_optcomp"
+bug-reports: "https://github.com/janestreet/ppx_optcomp/issues"
+dev-repo: "https://github.com/janestreet/ppx_optcomp.git"
+license: "Apache-2.0"
+build: [
+  ["./configure" "--prefix" prefix]
+  [make]
+]
+depends: [
+  "ocamlbuild" {build}
+  "ocamlfind"  {build & >= "1.3.2"}
+  "ppx_core"   {>= "113.33.00+4.03" & < "113.34.00+4.03"}
+  "ppx_tools"  {>= "0.99.3"}
+]
+available: [ ocaml-version >= "4.04.0" ]
diff --git a/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/url b/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/url
new file mode 100644
index 00000000000..34733d268d2
--- /dev/null
+++ b/packages/ppx_optcomp/ppx_optcomp.113.33.01+4.03/url
@@ -0,0 +1,2 @@
+archive: "https://github.com/janestreet/ppx_optcomp/archive/113.33.01+4.03.tar.gz"
+checksum: "3ed4fade382e98f87b9fee760911aef6"