Algorithm::Permute - Handy and fast permutation with object oriented interface As of version 0.11, a different implementation of the same permutation generator algorithm can be chosen at compile time. This one uses linked list instead of array, and hopefully a little bit faster. To enable this, run Makefile.PL with a custom DEFINE argument: perl Makefile.PL DEFINE="-DPERL_EXT -DUSE_LINKEDLIST" This option only affects the iterative style (OO) interface. The callback interface remains unaffected.