diff --git a/packages/spotlib/spotlib.4.0.3/descr b/packages/spotlib/spotlib.4.0.3/descr
new file mode 100644
index 00000000000..b73a41b142f
--- /dev/null
+++ b/packages/spotlib/spotlib.4.0.3/descr
@@ -0,0 +1,3 @@
+Useful functions for OCaml programming used by @camlspotter
+Spotlib is a small library package used for several softwares by Jun Furuse.
+It is almost a poor replication of Jane Street Core, but it is small.
diff --git a/packages/spotlib/spotlib.4.0.3/opam b/packages/spotlib/spotlib.4.0.3/opam
new file mode 100644
index 00000000000..5d25db909d5
--- /dev/null
+++ b/packages/spotlib/spotlib.4.0.3/opam
@@ -0,0 +1,15 @@
+opam-version: "1.2"
+version: "4.0.3"
+maintainer: "jun.furuse@gmail.com"
+authors: "Jun Furuse"
+homepage: "https://bitbucket.org/camlspotter/spotlib"
+bug-reports:
+  "https://bitbucket.org/camlspotter/spotlib/issues?status=new&status=open"
+dev-repo: "hg://https://bitbucket.org/camlspotter/spotlib"
+build: ["jbuilder" "build" "-p" name "-j" jobs]
+depends: [
+  "ocamlfind" {build}
+  "jbuilder" {build}
+  "ppx_test" {>= "1.6.0"}
+]
+available: [ocaml-version >= "4.04.0"]
diff --git a/packages/spotlib/spotlib.4.0.3/url b/packages/spotlib/spotlib.4.0.3/url
new file mode 100644
index 00000000000..5fa5cef9f12
--- /dev/null
+++ b/packages/spotlib/spotlib.4.0.3/url
@@ -0,0 +1,2 @@
+archive: "https://bitbucket.org/camlspotter/spotlib/get/4.0.3.tar.gz"
+checksum: "77aa7e7718b43ebe6d7795f694c1d775"