diff --git a/packages/upstream-extra/mdx.1.8.1/opam b/packages/upstream-extra/mdx.1.8.1/opam
deleted file mode 100644
index 070214a49..000000000
--- a/packages/upstream-extra/mdx.1.8.1/opam
+++ /dev/null
@@ -1,65 +0,0 @@
-opam-version: "2.0"
-name: "mdx"
-version: "1.8.1"
-synopsis: "Executable code blocks inside markdown files"
-description: """\
-`ocaml-mdx` allows to execute code blocks inside markdown files.
-There are (currently) two sub-commands, corresponding
-to two modes of operations: pre-processing (`ocaml-mdx pp`)
-and tests (`ocaml-mdx test`).
-
-The pre-processor mode allows to mix documentation and code,
-and to practice "literate programming" using markdown and OCaml.
-
-The test mode allows to ensure that shell scripts and OCaml fragments
-in the documentation always stays up-to-date.
-
-`ocaml-mdx` is released as two binaries called `ocaml-mdx` and `mdx` which are
-the same, mdx being the deprecated name, kept for now for compatibility."""
-maintainer: "Thomas Gazagnaire <thomas@gazagnaire.org>"
-authors: "Thomas Gazagnaire <thomas@gazagnaire.org>"
-license: "ISC"
-homepage: "https://github.com/realworldocaml/mdx"
-bug-reports: "https://github.com/realworldocaml/mdx/issues"
-depends: [
-  "dune" {>= "2.2"}
-  "ocaml" {>= "4.02.3" & < "4.13"}
-  "ocamlfind" {>= "1.7.2"}
-  "fmt" {>= "0.8.5"}
-  "cppo" {build & >= "1.1.0"}
-  "csexp" {>= "1.3.2"}
-  "astring"
-  "logs" {>= "0.5.0"}
-  "cmdliner" {>= "1.0.0"}
-  "re" {>= "1.7.2"}
-  "result"
-  "ocaml-version" {>= "2.3.0"}
-  "odoc" {>= "1.5.0" & < "2.0.0"}
-  "lwt" {with-test}
-  "alcotest" {with-test}
-  "cmdliner" {with-test & < "1.1.0"}
-]
-build: [
-  ["dune" "subst"] {dev}
-  [
-    "dune"
-    "build"
-    "-p"
-    name
-    "-j"
-    jobs
-    "@install"
-    "@runtest" {with-test}
-    "@doc" {with-doc}
-  ]
-]
-dev-repo: "git+https://github.com/realworldocaml/mdx.git"
-url {
-  src:
-    "https://github.com/realworldocaml/mdx/releases/download/1.8.1/mdx-1.8.1.tbz"
-  checksum: [
-    "sha256=9b0da52022ce7c26897335c25791a62e029b046b725b1db3447a8be76998f1eb"
-    "sha512=1187bbd7823416996f207057e9a5c40d483d10b1f52fc05b5a3cb64a1f869eac66279ea2ffd21295620e6654f5d1d7883285db0548a0fb01573b9e5b1fd6a4f3"
-  ]
-}
-x-commit-hash: "315b3cceaa14cda5443ca065429dcc06f297eb5a"