Index: libi4uc/i4ucprofilebuilder.vala
===================================================================
--- libi4uc/i4ucprofilebuilder.vala	(revision c69cac3f0835ea519e82066474f92c41f13d1ce2)
+++ libi4uc/i4ucprofilebuilder.vala	(revision e20be4a7bb7f7ce258435a7e11766c564c2abbc0)
@@ -47,5 +47,5 @@
 	}
 
-	public void build ()
+	public void build () throws GLib.Error
 	{
 		if (_is_building)
@@ -103,5 +103,5 @@
 	}
 	
-	public void clean ()
+	public void clean () throws GLib.Error
 	{
 		if (_is_building)
@@ -168,5 +168,5 @@
 	}
 
-	private bool check_mtime (string newer_uri, string older_uri)
+	private bool check_mtime (string newer_uri, string older_uri) throws GLib.Error
 	{
 		var newer_file = File.new_for_uri (newer_uri);