diff --git a/kcmkwin/kwindecoration/preview.cpp b/kcmkwin/kwindecoration/preview.cpp
index 8e80ea2992..6e26aedb92 100644
--- a/kcmkwin/kwindecoration/preview.cpp
+++ b/kcmkwin/kwindecoration/preview.cpp
@@ -397,5 +397,10 @@ unsigned long KDecorationPreviewOptions::updateSettings()
     changed |= d->updateKWinSettings( &cfg );
     return changed;
     }
+
+bool KDecorationPreviewPlugins::provides( Requirement )
+    {
+    return false;
+    }
     
 #include "preview.moc"
diff --git a/kcmkwin/kwindecoration/preview.h b/kcmkwin/kwindecoration/preview.h
index c63770eb3f..13e1483cbf 100644
--- a/kcmkwin/kwindecoration/preview.h
+++ b/kcmkwin/kwindecoration/preview.h
@@ -24,11 +24,11 @@
 
 #include <qwidget.h>
 #include <kdecoration_p.h>
+#include <kdecoration_plugins_p.h>
 
 class QLabel;
 
 class KDecorationPreviewBridge;
-class KDecorationPlugins;
 class KDecorationOptions;
 
 class KDecorationPreview
@@ -117,5 +117,18 @@ class KDecorationPreviewOptions
         virtual ~KDecorationPreviewOptions();
         virtual unsigned long updateSettings();
     };
-        
+
+class KDecorationPreviewPlugins
+    : public KDecorationPlugins
+    {
+    public:
+        KDecorationPreviewPlugins( KConfig* cfg );
+        virtual bool provides( Requirement );
+    };
+
+inline KDecorationPreviewPlugins::KDecorationPreviewPlugins( KConfig* cfg )
+    : KDecorationPlugins( cfg )
+    {
+    }
+
 #endif
diff --git a/lib/kdecoration.h b/lib/kdecoration.h
index 4a2f79931e..b75d72465d 100644
--- a/lib/kdecoration.h
+++ b/lib/kdecoration.h
@@ -125,8 +125,19 @@ public:
         BorderOversized, ///< Oversized borders
         BordersCount     ///< @internal
         };
+
+    enum Ability { ABILITY_DUMMY = 10000000 };
+
+    enum Requirement { REQUIREMENT_DUMMY = 1000000 };
 };    
 
+class KDecorationProvides
+    : public KDecorationDefines
+    {
+    public:
+        virtual bool provides( Requirement req ) = 0;
+    };
+
 /**
  * This class holds various configuration settings for the decoration.
  * It is accessible from the decorations either as KDecoration::options()
diff --git a/lib/kdecoration_plugins_p.cpp b/lib/kdecoration_plugins_p.cpp
index 3f9341269e..975aa388ab 100644
--- a/lib/kdecoration_plugins_p.cpp
+++ b/lib/kdecoration_plugins_p.cpp
@@ -161,6 +161,7 @@ bool KDecorationPlugins::loadPlugin( QString nameStr )
         return false;
         }
     fact = create_ptr();
+    fact->checkRequirements( this ); // let it check what is supported
 
     pluginStr = nameStr;
     
diff --git a/lib/kdecoration_plugins_p.h b/lib/kdecoration_plugins_p.h
index e283071aa0..36206fdfe6 100644
--- a/lib/kdecoration_plugins_p.h
+++ b/lib/kdecoration_plugins_p.h
@@ -34,13 +34,16 @@ DEALINGS IN THE SOFTWARE.
 #include <qstring.h>
 #include <qwidget.h>
 
+#include "kdecoration.h"
+
 class KLibrary;
+class KConfig;
 class KDecoration;
 class KDecorationBridge;
 class KDecorationFactory;
-class KConfig;
 
 class KDecorationPlugins
+    : public KDecorationProvides
     {
     public:
         KDecorationPlugins( KConfig* cfg );
diff --git a/lib/kdecorationfactory.cpp b/lib/kdecorationfactory.cpp
index 38cf41ba01..74508501b1 100644
--- a/lib/kdecorationfactory.cpp
+++ b/lib/kdecorationfactory.cpp
@@ -47,6 +47,10 @@ bool KDecorationFactory::supports( Ability )
     return false;
     }
 
+void KDecorationFactory::checkRequirements( KDecorationProvides* )
+    {
+    }
+
 QValueList< KDecorationDefines::BorderSize > KDecorationFactory::borderSizes() const
     {
     return QValueList< BorderSize >() << BorderNormal;
diff --git a/lib/kdecorationfactory.h b/lib/kdecorationfactory.h
index f55f3058f2..093f8fe34b 100644
--- a/lib/kdecorationfactory.h
+++ b/lib/kdecorationfactory.h
@@ -35,7 +35,6 @@ class KDecorationFactory
     : public KDecorationDefines
     {
     public:
-        enum Ability { NOTHING_YET }; // FRAME pridat, + pamatovat na 32bitu?
 	/**
 	 * Constructor. Called after loading the decoration plugin. All global
 	 * initialization of the plugin should be done in the factory constructor.
@@ -72,6 +71,8 @@ class KDecorationFactory
         virtual QValueList< BorderSize > borderSizes() const;
 
         virtual bool supports( Ability ability );
+        
+        virtual void checkRequirements( KDecorationProvides* provides );
 	/**
 	 * Returns the KDecorationOptions object, which is used to access
 	 * configuration settings for the decoration.
diff --git a/plugins.cpp b/plugins.cpp
index fe88774107..5ab58e75da 100644
--- a/plugins.cpp
+++ b/plugins.cpp
@@ -34,4 +34,9 @@ void PluginMgr::error( const QString &error_msg )
     exit(1);
     }
 
+bool PluginMgr::provides( Requirement )
+    {
+    return false;
+    }
+
 } // namespace
diff --git a/plugins.h b/plugins.h
index fc6c200459..7e779098c6 100644
--- a/plugins.h
+++ b/plugins.h
@@ -22,6 +22,7 @@ class PluginMgr
     {
     public:
         PluginMgr();
+        virtual bool provides( Requirement );
     protected:
         virtual void error( const QString& error_msg );
     };