diff --git a/packages/conf-rocksdb-ge-5-17-2/conf-rocksdb-ge-5-17-2.5.17.2/opam b/packages/conf-rocksdb-ge-5-17-2/conf-rocksdb-ge-5-17-2.5.17.2/opam
new file mode 100644
index 00000000000..e92ba557835
--- /dev/null
+++ b/packages/conf-rocksdb-ge-5-17-2/conf-rocksdb-ge-5-17-2.5.17.2/opam
@@ -0,0 +1,37 @@
+opam-version: "2.0"
+homepage: "http://rocksdb.org/"
+maintainer: "Chet Murthy <chetsky@gmail.com>"
+x-maintenance-intent: [ "(latest)" ]
+authors: "Chet Murthy (copied from Anton Bachin)"
+bug-reports: "https://github.com/chetmurthy/ocaml-rocksdb/issues"
+license: "Apache-2.0"
+
+depends: [
+  "conf-rocksdb"
+  "conf-pkg-config" {build}
+  (("host-arch-x86_32" {os = "win32" & os-distribution != "cygwinports"} & "conf-mingw-w64-zstd-i686" {os = "win32" & os-distribution != "cygwinports"}) |
+   ("host-arch-x86_64" {os = "win32" & os-distribution != "cygwinports"} & "conf-mingw-w64-zstd-x86_64" {os = "win32" & os-distribution != "cygwinports"}))
+]
+build: [
+
+  ["pkgconf" {os = "win32" & os-distribution = "cygwin"}
+   "--personality=i686-w64-mingw32" {os = "win32" & os-distribution = "cygwin" & host-arch-x86_32:installed}
+   "--personality=x86_64-w64-mingw32" {os = "win32" & os-distribution = "cygwin" & host-arch-x86_64:installed}
+   "pkg-config" {os != "win32" | os-distribution != "cygwin"}
+   "--atleast-version=7.8.3" "rocksdb"] {
+    !(os-distribution = "debian" & (os-version = 11 | os-version = 12)) &
+    !(os-distribution = "ubuntu" & (os-version = "20.04" | os-version = "22.04"))
+   }
+]
+synopsis: "Virtual package relying on a system installation of RocksDB (version >= 5.17.2)"
+description: """
+The build section merits an explanation.
+
+(1) for debian 11/12, conf-rocksdb ensures that rocksdb gets installed.  But it'll be backlevel,
+and specifically either 5.17.2 or 6.11.4 -- versions that do not come with pkg-config files.
+So we just skip the test.
+
+(2) For all other OS versions, we check what pkg-config says.
+"""
+
+flags: conf
diff --git a/packages/ocaml-rocksdb/ocaml-rocksdb.0.02/opam b/packages/ocaml-rocksdb/ocaml-rocksdb.0.02/opam
new file mode 100644
index 00000000000..599de0d6ea7
--- /dev/null
+++ b/packages/ocaml-rocksdb/ocaml-rocksdb.0.02/opam
@@ -0,0 +1,59 @@
+
+synopsis: "An OCaml interface to RocksDB (generated by ocaml-cppffigen"
+description:
+"""
+This is an OCaml interface to RocksDB, generated by the ocaml-cppffigen tool
+"""
+opam-version: "2.0"
+x-maintenance-intent: [ "(latest)" ]
+maintainer: "Chet Murthy <chetsky@gmail.com>"
+authors: ["Chet Murthy"]
+homepage: "https://github.com/chetmurthy/ocaml-rocksdb"
+license: "Apache-2.0"
+bug-reports: "https://github.com/chetmurthy/ocaml-rocksdb/issues"
+dev-repo: "git+https://github.com/chetmurthy/ocaml-rocksdb.git"
+doc: "https://github.com/chetmurthy/ocaml-rocksdb/doc"
+
+depends: [
+  "ocaml"       { >= "4.10.0" }
+  "camlp5-buildscripts" { >= "0.02" }
+  "not-ocamlfind" { >= "0.10" }
+  "cppffigen"
+  "conf-g++"
+  "conf-snappy"
+  "conf-zlib"
+  "conf-liblz4"
+  "conf-libbz2"
+  "conf-rocksdb-ge-5-17-2"
+  "result"
+  "core"
+  "ounit" { >= "2.2.7" & with-test}
+]
+build: [
+  [make
+   "BACKLEVEL_ROCKSDB=1" {
+    (arch = "x86_64" & os-distribution = "debian" & (os-version = 11 | os-version = 12)) |
+    (arch = "x86_64" & os-distribution = "ubuntu" & (os-version = "20.04" | os-version = "22.04"))
+   }
+   "sys"]
+  [make
+   "BACKLEVEL_ROCKSDB=1" {
+    (arch = "x86_64" & os-distribution = "debian" & (os-version = 11 | os-version = 12)) |
+    (arch = "x86_64" & os-distribution = "ubuntu" & (os-version = "20.04"))
+   }
+   "test"] {with-test}
+]
+install: [
+  [make
+   "BACKLEVEL_ROCKSDB=1" {
+    (arch = "x86_64" & os-distribution = "debian" & (os-version = 11 | os-version = 12)) |
+    (arch = "x86_64" & os-distribution = "ubuntu" & (os-version = "20.04"))
+   }
+   "install"]
+]
+url {
+  src: "https://github.com/chetmurthy/ocaml-rocksdb/archive/refs/tags/0.02.tar.gz"
+  checksum: [
+    "sha512=b2b2b36b4c34ee7cc158dbe8d0eeff6955d36f5d665ec8e78a899635bd8ac3f3c7a956132b95d0096304f7fbd8a6c4034527eeb951a3a26e4cc12b17e6fc0d87"
+  ]
+}