diff --git a/lib/arc/exceptions.ex b/lib/arc/exceptions.ex
index 94fc845..f4a734a 100644
--- a/lib/arc/exceptions.ex
+++ b/lib/arc/exceptions.ex
@@ -4,10 +4,19 @@ defmodule Arc.MissingExecutableError do
   def exception(opts) do
     message = Keyword.fetch!(opts, :message)
 
-    msg = """
-    Cannot locate executable: #{message}
-    """
+    msg = case unix_operating_system?() do
+      true ->
+        "Please look into installing imagemagick first."
+      false ->
+        ""
+    end
+
+    msg = msg <> " \n Cannot locate executable: #{message}"
 
     %__MODULE__{message: msg}
   end
+
+  defp unix_operating_system?() do
+    {:unix, :darwin} == :os.type()
+  end
 end
diff --git a/lib/arc/storage/s3.ex b/lib/arc/storage/s3.ex
index cd15eba..b7a7492 100644
--- a/lib/arc/storage/s3.ex
+++ b/lib/arc/storage/s3.ex
@@ -6,7 +6,6 @@ defmodule Arc.Storage.S3 do
     destination_dir = definition.storage_dir(version, {file, scope})
     s3_bucket = s3_bucket(definition)
     s3_key = Path.join(destination_dir, file.file_name)
-    asset_host = asset_host(definition)
     acl = definition.acl(version, {file, scope})
 
     s3_options =