gistfile1.txt

```
     # The public API is true/false, but we need to pass a path to a dylib to
     # run-loop.
-    if args.fetch(:inject_dylib, false)
-      if simulator_target?(args)
-        args[:inject_dylib] = Calabash::Dylibs.path_to_sim_dylib
-      else
-        args[:inject_dylib] = Cucumber::Dylibs.path_to_device_dylib
+    use_dylib = args.fetch(:inject_dylib, nil)
+    if use_dylib
+      if !File.exist?(use_dylib)
+        if simulator_target?(args)
+          args[:inject_dylib] = Calabash::Dylibs.path_to_sim_dylib
+        else
+          args[:inject_dylib] = Cucumber::Dylibs.path_to_device_dylib
+        end
       end
```