1.1 --- a/lemon/concepts/heap.h	Sun Feb 22 09:52:44 2009 +0000
     1.2 +++ b/lemon/concepts/heap.h	Mon Feb 23 11:58:39 2009 +0100
     1.3 @@ -24,6 +24,7 @@
     1.4  #define LEMON_CONCEPT_HEAP_H
     1.5  
     1.6  #include <lemon/core.h>
     1.7 +#include <lemon/concept_check.h>
     1.8  
     1.9  namespace lemon {
    1.10