diff --git a/packages/dot-merlin-reader/dot-merlin-reader.4.17/opam b/packages/dot-merlin-reader/dot-merlin-reader.4.17/opam
new file mode 100644
index 00000000000..9487eeecb44
--- /dev/null
+++ b/packages/dot-merlin-reader/dot-merlin-reader.4.17/opam
@@ -0,0 +1,30 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+synopsis:     "Reads config files for merlin"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "4.14"}
+  "dune" {>= "2.9.0"}
+  "merlin-lib" {>= "4.17"}
+  "ocamlfind" {>= "1.6.0"}
+]
+description:
+  "Helper process: reads .merlin files and outputs the normalized content to
+  stdout."
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v4.17.1-414/merlin-4.17.1-414.tbz"
+  checksum: [
+    "sha256=bf3f806ef48632053861d54b73bdef9539ba4218af021d8b0acad8e37e645fc6"
+    "sha512=1346170208fa984dfdb45dcce0b44aa8a25a8f8d5ae6da9fbdf521f6abeacf5cc7ac7a567061c2a08c157465f3fb5d59a1c238b634bc74b678816b48bdf05109"
+  ]
+}
+x-commit-hash: "44c112461cab98b9279798271d003fccda2badba"
diff --git a/packages/dot-merlin-reader/dot-merlin-reader.5.2/opam b/packages/dot-merlin-reader/dot-merlin-reader.5.2/opam
new file mode 100644
index 00000000000..68dcfb44d10
--- /dev/null
+++ b/packages/dot-merlin-reader/dot-merlin-reader.5.2/opam
@@ -0,0 +1,30 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+synopsis:     "Reads config files for merlin"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "5.2" }
+  "dune" {>= "2.9.0"}
+  "merlin-lib" {>= "5.2"}
+  "ocamlfind" {>= "1.6.0"}
+]
+description:
+  "Helper process: reads .merlin files and outputs the normalized content to
+  stdout."
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v5.2.1-502/merlin-5.2.1-502.tbz"
+  checksum: [
+    "sha256=5c02dc71b2d31b619851c14a965b91c650a4dbcd49bf56004eee61e0c58d584c"
+    "sha512=abf82c906759c8547437664ab5db67b839bbad185fa2541b28e4e07137fdf3824736dae859f0d35bd9a3950633c81a69fd0a1a0e2393ead43822afc66d1aaf3d"
+  ]
+}
+x-commit-hash: "0eaccc1b8520d605b1e00685e1c3f8acb5da534c"
diff --git a/packages/merlin-lib/merlin-lib.4.17.1-414/opam b/packages/merlin-lib/merlin-lib.4.17.1-414/opam
new file mode 100644
index 00000000000..5d40fdc2bc0
--- /dev/null
+++ b/packages/merlin-lib/merlin-lib.4.17.1-414/opam
@@ -0,0 +1,35 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "4.14" & < "4.15"}
+  "dune" {>= "2.9.0"}
+  "csexp" {>= "1.5.1"}
+  "alcotest" {with-test}
+  "menhir"    {dev & >= "20201216"}
+  "menhirLib" {dev & >= "20201216"}
+  "menhirSdk" {dev & >= "20201216"}
+]
+synopsis:
+  "Merlin's libraries"
+description:
+  "These libraries provides access to low-level compiler interfaces and the
+  standard higher-level merlin protocol. The library is provided as-is, is not
+  thoroughly documented, and its public API might break with any new release."
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v4.17.1-414/merlin-4.17.1-414.tbz"
+  checksum: [
+    "sha256=bf3f806ef48632053861d54b73bdef9539ba4218af021d8b0acad8e37e645fc6"
+    "sha512=1346170208fa984dfdb45dcce0b44aa8a25a8f8d5ae6da9fbdf521f6abeacf5cc7ac7a567061c2a08c157465f3fb5d59a1c238b634bc74b678816b48bdf05109"
+  ]
+}
+x-commit-hash: "44c112461cab98b9279798271d003fccda2badba"
diff --git a/packages/merlin-lib/merlin-lib.4.17.1-501/opam b/packages/merlin-lib/merlin-lib.4.17.1-501/opam
new file mode 100644
index 00000000000..00f56ce81da
--- /dev/null
+++ b/packages/merlin-lib/merlin-lib.4.17.1-501/opam
@@ -0,0 +1,35 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "5.1.1" & < "5.2"}
+  "dune" {>= "2.9.0"}
+  "csexp" {>= "1.5.1"}
+  "alcotest" {with-test}
+  "menhir"    {dev & >= "20201216"}
+  "menhirLib" {dev & >= "20201216"}
+  "menhirSdk" {dev & >= "20201216"}
+]
+synopsis:
+  "Merlin's libraries"
+description:
+  "These libraries provides access to low-level compiler interfaces and the
+  standard higher-level merlin protocol. The library is provided as-is, is not
+  thoroughly documented, and its public API might break with any new release."
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v4.17.1-501/merlin-4.17.1-501.tbz"
+  checksum: [
+    "sha256=376707aa871f09e9639456d3fbe4b89a21c9ad75c774e94cbbbe67f842b0a500"
+    "sha512=a11ea4b8e3520b3ee41ae8198cda34b2816b8dfcdcb99350ef29689a7d62bb66d17ffa075c551aa56d521120b55e6db14a106a31f7b3970ed2aa07e1db3c9b88"
+  ]
+}
+x-commit-hash: "650a7865bc37a646250f7c52fa6644d9d4a5218b"
diff --git a/packages/merlin-lib/merlin-lib.5.2.1-502/opam b/packages/merlin-lib/merlin-lib.5.2.1-502/opam
new file mode 100644
index 00000000000..3ab219a1134
--- /dev/null
+++ b/packages/merlin-lib/merlin-lib.5.2.1-502/opam
@@ -0,0 +1,35 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "5.2" & < "5.3"}
+  "dune" {>= "3.0.0"}
+  "csexp" {>= "1.5.1"}
+  "alcotest" {with-test}
+  "menhir"    {dev & >= "20201216"}
+  "menhirLib" {dev & >= "20201216"}
+  "menhirSdk" {dev & >= "20201216"}
+]
+synopsis:
+  "Merlin's libraries"
+description:
+  "These libraries provides access to low-level compiler interfaces and the
+  standard higher-level merlin protocol. The library is provided as-is, is not
+  thoroughly documented, and its public API might break with any new release."
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v5.2.1-502/merlin-5.2.1-502.tbz"
+  checksum: [
+    "sha256=5c02dc71b2d31b619851c14a965b91c650a4dbcd49bf56004eee61e0c58d584c"
+    "sha512=abf82c906759c8547437664ab5db67b839bbad185fa2541b28e4e07137fdf3824736dae859f0d35bd9a3950633c81a69fd0a1a0e2393ead43822afc66d1aaf3d"
+  ]
+}
+x-commit-hash: "0eaccc1b8520d605b1e00685e1c3f8acb5da534c"
diff --git a/packages/merlin/merlin.4.17.1-414/opam b/packages/merlin/merlin.4.17.1-414/opam
new file mode 100644
index 00000000000..fb10c8cf2e2
--- /dev/null
+++ b/packages/merlin/merlin.4.17.1-414/opam
@@ -0,0 +1,81 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+]
+depends: [
+  "ocaml" {>= "4.14" & < "4.15"}
+  "dune" {>= "2.9.0"}
+  "merlin-lib" {= version}
+  "dot-merlin-reader" {>= "4.17"}
+  "yojson" {>= "2.0.0"}
+  "conf-jq" {with-test}
+  "ppxlib" {with-test}
+]
+conflicts: [
+  "seq" {!= "base"}
+  "base-effects"
+]
+synopsis:
+  "Editor helper, provides completion, typing and source browsing in Vim and Emacs"
+description:
+  "Merlin is an assistant for editing OCaml code. It aims to provide the features available in modern IDEs: error reporting, auto completion, source browsing and much more."
+post-messages: [
+  "merlin installed.
+
+Quick setup for VIM
+-------------------
+Append this to your .vimrc to add merlin to vim's runtime-path:
+  let g:opamshare = substitute(system('opam var share'),'\\n$','','''')
+  execute \"set rtp+=\" . g:opamshare . \"/merlin/vim\"
+
+Also run the following line in vim to index the documentation:
+  :execute \"helptags \" . g:opamshare . \"/merlin/vim/doc\"
+
+Quick setup for EMACS
+-------------------
+Add opam emacs directory to your load-path by appending this to your .emacs:
+  (let ((opam-share (ignore-errors (car (process-lines \"opam\" \"var\" \"share\")))))
+   (when (and opam-share (file-directory-p opam-share))
+    ;; Register Merlin
+    (add-to-list 'load-path (expand-file-name \"emacs/site-lisp\" opam-share))
+    (autoload 'merlin-mode \"merlin\" nil t nil)
+    ;; Automatically start it in OCaml buffers
+    (add-hook 'tuareg-mode-hook 'merlin-mode t)
+    (add-hook 'caml-mode-hook 'merlin-mode t)
+    ;; Use opam switch to lookup ocamlmerlin binary
+    (setq merlin-command 'opam)
+    ;; To easily change opam switches within a given Emacs session, you can
+    ;; install the minor mode https://github.com/ProofGeneral/opam-switch-mode
+    ;; and use one of its \"OPSW\" menus.
+    ))
+Take a look at https://github.com/ocaml/merlin for more information
+
+Quick setup with opam-user-setup
+--------------------------------
+
+Opam-user-setup support Merlin.
+
+  $ opam user-setup install
+
+should take care of basic setup.
+See https://github.com/OCamlPro/opam-user-setup
+"
+  {success & !user-setup:installed}
+]
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v4.17.1-414/merlin-4.17.1-414.tbz"
+  checksum: [
+    "sha256=bf3f806ef48632053861d54b73bdef9539ba4218af021d8b0acad8e37e645fc6"
+    "sha512=1346170208fa984dfdb45dcce0b44aa8a25a8f8d5ae6da9fbdf521f6abeacf5cc7ac7a567061c2a08c157465f3fb5d59a1c238b634bc74b678816b48bdf05109"
+  ]
+}
+x-commit-hash: "44c112461cab98b9279798271d003fccda2badba"
diff --git a/packages/merlin/merlin.4.17.1-501/opam b/packages/merlin/merlin.4.17.1-501/opam
new file mode 100644
index 00000000000..2e263c4d5fb
--- /dev/null
+++ b/packages/merlin/merlin.4.17.1-501/opam
@@ -0,0 +1,81 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+]
+depends: [
+  "ocaml" {>= "5.1" & < "5.2"}
+  "dune" {>= "2.9.0"}
+  "merlin-lib" {= version}
+  "dot-merlin-reader" {>= "4.17"}
+  "yojson" {>= "2.0.0"}
+  "conf-jq" {with-test}
+  "ppxlib" {with-test}
+]
+conflicts: [
+  "seq" {!= "base"}
+  "base-effects"
+]
+synopsis:
+  "Editor helper, provides completion, typing and source browsing in Vim and Emacs"
+description:
+  "Merlin is an assistant for editing OCaml code. It aims to provide the features available in modern IDEs: error reporting, auto completion, source browsing and much more."
+post-messages: [
+  "merlin installed.
+
+Quick setup for VIM
+-------------------
+Append this to your .vimrc to add merlin to vim's runtime-path:
+  let g:opamshare = substitute(system('opam var share'),'\\n$','','''')
+  execute \"set rtp+=\" . g:opamshare . \"/merlin/vim\"
+
+Also run the following line in vim to index the documentation:
+  :execute \"helptags \" . g:opamshare . \"/merlin/vim/doc\"
+
+Quick setup for EMACS
+-------------------
+Add opam emacs directory to your load-path by appending this to your .emacs:
+  (let ((opam-share (ignore-errors (car (process-lines \"opam\" \"var\" \"share\")))))
+   (when (and opam-share (file-directory-p opam-share))
+    ;; Register Merlin
+    (add-to-list 'load-path (expand-file-name \"emacs/site-lisp\" opam-share))
+    (autoload 'merlin-mode \"merlin\" nil t nil)
+    ;; Automatically start it in OCaml buffers
+    (add-hook 'tuareg-mode-hook 'merlin-mode t)
+    (add-hook 'caml-mode-hook 'merlin-mode t)
+    ;; Use opam switch to lookup ocamlmerlin binary
+    (setq merlin-command 'opam)
+    ;; To easily change opam switches within a given Emacs session, you can
+    ;; install the minor mode https://github.com/ProofGeneral/opam-switch-mode
+    ;; and use one of its \"OPSW\" menus.
+    ))
+Take a look at https://github.com/ocaml/merlin for more information
+
+Quick setup with opam-user-setup
+--------------------------------
+
+Opam-user-setup support Merlin.
+
+  $ opam user-setup install
+
+should take care of basic setup.
+See https://github.com/OCamlPro/opam-user-setup
+"
+  {success & !user-setup:installed}
+]
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v4.17.1-501/merlin-4.17.1-501.tbz"
+  checksum: [
+    "sha256=376707aa871f09e9639456d3fbe4b89a21c9ad75c774e94cbbbe67f842b0a500"
+    "sha512=a11ea4b8e3520b3ee41ae8198cda34b2816b8dfcdcb99350ef29689a7d62bb66d17ffa075c551aa56d521120b55e6db14a106a31f7b3970ed2aa07e1db3c9b88"
+  ]
+}
+x-commit-hash: "650a7865bc37a646250f7c52fa6644d9d4a5218b"
diff --git a/packages/merlin/merlin.5.2.1-502/opam b/packages/merlin/merlin.5.2.1-502/opam
new file mode 100644
index 00000000000..7cb384e2d3a
--- /dev/null
+++ b/packages/merlin/merlin.5.2.1-502/opam
@@ -0,0 +1,82 @@
+opam-version: "2.0"
+maintainer:   "defree@gmail.com"
+authors:      "The Merlin team"
+homepage:     "https://github.com/ocaml/merlin"
+bug-reports:  "https://github.com/ocaml/merlin/issues"
+dev-repo:     "git+https://github.com/ocaml/merlin.git"
+license:      "MIT"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+]
+depends: [
+  "ocaml" {>= "5.2" & < "5.3"}
+  "dune" {>= "3.0.0"}
+  "merlin-lib" {= version}
+  "dot-merlin-reader" {>= "5.2"}
+  "ocaml-index" {>= "1.0" & post}
+  "yojson" {>= "2.0.0"}
+  "conf-jq" {with-test}
+  "ppxlib" {with-test}
+]
+conflicts: [
+  "seq" {!= "base"}
+  "base-effects"
+]
+synopsis:
+  "Editor helper, provides completion, typing and source browsing in Vim and Emacs"
+description:
+  "Merlin is an assistant for editing OCaml code. It aims to provide the features available in modern IDEs: error reporting, auto completion, source browsing and much more."
+post-messages: [
+  "merlin installed.
+
+Quick setup for VIM
+-------------------
+Append this to your .vimrc to add merlin to vim's runtime-path:
+  let g:opamshare = substitute(system('opam var share'),'\\n$','','''')
+  execute \"set rtp+=\" . g:opamshare . \"/merlin/vim\"
+
+Also run the following line in vim to index the documentation:
+  :execute \"helptags \" . g:opamshare . \"/merlin/vim/doc\"
+
+Quick setup for EMACS
+-------------------
+Add opam emacs directory to your load-path by appending this to your .emacs:
+  (let ((opam-share (ignore-errors (car (process-lines \"opam\" \"var\" \"share\")))))
+   (when (and opam-share (file-directory-p opam-share))
+    ;; Register Merlin
+    (add-to-list 'load-path (expand-file-name \"emacs/site-lisp\" opam-share))
+    (autoload 'merlin-mode \"merlin\" nil t nil)
+    ;; Automatically start it in OCaml buffers
+    (add-hook 'tuareg-mode-hook 'merlin-mode t)
+    (add-hook 'caml-mode-hook 'merlin-mode t)
+    ;; Use opam switch to lookup ocamlmerlin binary
+    (setq merlin-command 'opam)
+    ;; To easily change opam switches within a given Emacs session, you can
+    ;; install the minor mode https://github.com/ProofGeneral/opam-switch-mode
+    ;; and use one of its \"OPSW\" menus.
+    ))
+Take a look at https://github.com/ocaml/merlin for more information
+
+Quick setup with opam-user-setup
+--------------------------------
+
+Opam-user-setup support Merlin.
+
+  $ opam user-setup install
+
+should take care of basic setup.
+See https://github.com/OCamlPro/opam-user-setup
+"
+  {success & !user-setup:installed}
+]
+url {
+  src:
+    "https://github.com/ocaml/merlin/releases/download/v5.2.1-502/merlin-5.2.1-502.tbz"
+  checksum: [
+    "sha256=5c02dc71b2d31b619851c14a965b91c650a4dbcd49bf56004eee61e0c58d584c"
+    "sha512=abf82c906759c8547437664ab5db67b839bbad185fa2541b28e4e07137fdf3824736dae859f0d35bd9a3950633c81a69fd0a1a0e2393ead43822afc66d1aaf3d"
+  ]
+}
+x-commit-hash: "0eaccc1b8520d605b1e00685e1c3f8acb5da534c"