1.1 --- a/lemon/matrix_maps.h	Tue May 16 17:13:42 2006 +0000
     1.2 +++ b/lemon/matrix_maps.h	Wed May 17 05:54:24 2006 +0000
     1.3 @@ -22,6 +22,7 @@
     1.4  
     1.5  #include <vector>
     1.6  #include <lemon/bits/utility.h>
     1.7 +#include <lemon/bits/invalid.h>
     1.8  #include <lemon/maps.h>
     1.9  
    1.10  #include <lemon/concept/matrix_maps.h>