Index: src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
===================================================================
--- src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java	(revision 739329)
+++ src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java	(working copy)
@@ -981,7 +981,36 @@
         List injectedProfiles = injectActiveProfiles( profileMgr, model );
 
         activeProfiles.addAll( injectedProfiles );
-
+        
+        // --------------------------------------------------------------------------------
+        // MNG-3641: print a warning if one of the profiles to be activated explicitly
+        // was not activated
+        
+        if( config != null && config.getGlobalProfileManager() != null )
+        {
+        	// get all activated profile ids
+	        List activeProfileIds = new ArrayList();
+	        
+	        for(Iterator it = activeProfiles.iterator(); it.hasNext(); )
+	        {
+	        	activeProfileIds.add( ((Profile) it.next()).getId() );
+	        }
+	        
+	        for (Iterator it = config.getGlobalProfileManager().getExplicitlyActivatedIds().iterator(); it.hasNext(); )
+	        {
+	        	String explicitProfileId = (String) it.next();
+	        	
+	        	if( !activeProfileIds.contains(explicitProfileId) )
+	        	{
+	        		getLogger().warn( "Profile with id: \'" + explicitProfileId + "\' has not been activated." );
+	        	}
+	        	
+	        }
+        }
+        
+        // --------------------------------------------------------------------------------
+        
+        
         // We don't need all the project methods that are added over those in the model, but we do need basedir
         Map context = new HashMap();