1.1 --- a/lemon/unionfind.h	Sun Dec 30 18:23:32 2007 +0000
     1.2 +++ b/lemon/unionfind.h	Mon Dec 31 19:21:21 2007 +0000
     1.3 @@ -28,6 +28,7 @@
     1.4  #include <list>
     1.5  #include <utility>
     1.6  #include <algorithm>
     1.7 +#include <functional>
     1.8  
     1.9  #include <lemon/bits/invalid.h>
    1.10