diff --git a/sasa.opam b/sasa.opam
index 92a8c50a221d4c220c460e0b2f84efd2eea361d1..26a7e19a2f6e15aadb95796955dd1112ede4e76e 100644
--- a/sasa.opam
+++ b/sasa.opam
@@ -20,16 +20,18 @@ depends: [
   "ocamlfind"
   "dune" { >= "2.0" }
   "ocamlgraph"
-  "conf-graphviz"
   "lutils"
   "psq"
   "qtest"
   "functory"
-  "ledit"
   "rdbg" { >= "1.200" }
-  "lustre-v6"
+]
+depopts: [
+  "conf-graphviz"
+  "ledit"
   "lutin"
-  ]
+  "lustre-v6"
+]
 build: [make "build"]
 install: ["dune" "install"]
 post-messages: ["The last version can be obtained via (opam repo add) http://www-verimag.imag.fr/DIST-TOOLS/SYNCHRONE/opam-repository/ "]