diff --git a/src/define.sh b/src/define.sh
index 62a6f9e..9da1979 100644
--- a/src/define.sh
+++ b/src/define.sh
@@ -1885,6 +1885,10 @@ skipVersion() {
   return 1
 }
 
+isCompatible() {
+  return 0
+}
+
 setMachine() {
 
   local id="$1"