--- a/checker.py	Sat Jul 30 13:48:34 2016 +0800
+++ b/checker.py	Sat Jul 30 16:11:32 2016 +0800
@@ -267,16 +267,19 @@
 
         lc = process_config(linter_config[name], linter)
 
-        if 'setup' in lc and str(lc['setup']) not in setup_cache:
-            for item in lc['setup']:
-                if not run(item):
-                    return False
-            setup_cache.add(str(lc['setup']))
+        key = (name, str(lc.get('setup', [])))
+        if key in setup_cache:
+            continue
+
+        for item in lc.get('setup', []):
+            if not run(item):
+                return False
 
         if 'version' in lc:
             if not run(lc['exec'] + lc['version'], env=lc['env']):
                 return False
 
+        setup_cache.add(key)
         if name not in installed:
             installed.append(name)