start with template code https://github.com/Kakadu/OCanren-basic-template

dune-project

@@ -0,0 +1,33 @@
+(lang dune 3.20)
+
+(name pass_strategy_synthesis)
+
+(generate_opam_files true)
+
+(source
+ (github username/reponame))
+
+(authors "Author Name <author@example.com>")
+
+(maintainers "Maintainer Name <maintainer@example.com>")
+
+(license LICENSE)
+
+(documentation https://url/to/documentation)
+
+(package
+ (name pass_strategy_synthesis)
+ (synopsis "A short synopsis")
+ (description "A longer description")
+ (depends
+  (ocaml
+   (= 4.14.2))
+  GT
+  (OCanren
+   (>= 0.3.0~))
+  (OCanren-ppx
+   (>= 0.3.0~)))
+ (tags
+  ("add topics" "to describe" your project)))
+
+; See the complete stanza docs at https://dune.readthedocs.io/en/stable/reference/dune-project/index.html