diff -urN /usr/ports/games/freedoko/files/patch-src__freedoko.cpp games/freedoko/files/patch-src__freedoko.cpp
--- /usr/ports/games/freedoko/files/patch-src__freedoko.cpp	1970-01-01 09:00:00.000000000 +0900
+++ games/freedoko/files/patch-src__freedoko.cpp	2013-11-25 00:00:00.000000000 +0900
@@ -0,0 +1,10 @@
+--- src/freedoko.cpp.orig
++++ src/freedoko.cpp
+@@ -43,6 +43,7 @@
+ #else
+ // for 'mkdir'
+ #include <sys/stat.h>
++#include <unistd.h>
+ #endif
+ 
+ #include "class/getopt/getopt.h"