### Eclipse Workspace Patch 1.0
#P org.eclipse.pde.ui
Index: src/org/eclipse/pde/internal/ui/editor/site/SiteEditor.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/editor/site/SiteEditor.java,v
retrieving revision 1.38
diff -u -r1.38 SiteEditor.java
--- src/org/eclipse/pde/internal/ui/editor/site/SiteEditor.java	15 Aug 2007 20:12:52 -0000	1.38
+++ src/org/eclipse/pde/internal/ui/editor/site/SiteEditor.java	17 Aug 2007 20:27:30 -0000
@@ -25,6 +25,8 @@
 import org.eclipse.jface.action.IToolBarManager;
 import org.eclipse.jface.operation.IRunnableWithProgress;
 import org.eclipse.pde.core.IModel;
+import org.eclipse.pde.core.IModelChangedEvent;
+import org.eclipse.pde.core.IModelChangedListener;
 import org.eclipse.pde.internal.core.PDECore;
 import org.eclipse.pde.internal.core.ifeature.IFeatureModel;
 import org.eclipse.pde.internal.core.isite.ISiteFeature;
@@ -179,9 +181,23 @@
 			};
 			fBuildAllAction.setToolTipText(PDEUIMessages.CategorySection_buildAll);
 			fBuildAllAction.setImageDescriptor(PDEPluginImages.DESC_BUILD_TOOL);
+			updateActionEnablement();
+			
+			((ISiteModel)getAggregateModel()).addModelChangedListener(new IModelChangedListener() {
+				public void modelChanged(IModelChangedEvent event) {
+					updateActionEnablement();
+				}
+			});
 		}
 		return fBuildAllAction;
 	}
+	
+	private void updateActionEnablement() {
+		if (((ISiteModel)getAggregateModel()).getSite().getFeatures().length > 0)
+			fBuildAllAction.setEnabled(true);
+		else
+			fBuildAllAction.setEnabled(false);
+	}
 
 	protected void handleBuild(ISiteFeature[] sFeatures) {
 		if (sFeatures.length == 0)