[opam] add missing dependency on dune

Jan Rochel · Jan Rochel · commit d2b5d06a2272 · 2021-07-26T15:11:35.000+02:00
diff --git a/ocsigenserver.opam b/ocsigenserver.opam
@@ -44,6 +44,7 @@ build: [
 install:[make "install.files"]
 depends: [
   "ocaml" {>= "4.08.1"}
+  "dune" {>= "2.7"}
   "ocamlfind"
   "base-unix"
   "base-threads"
