fixed compilation problem

SVN-Revision: 1664

diff --git a/src/level_subset.cpp b/src/level_subset.cpp
index 5d4e24f..c364e6b 100644 (file)
--- a/src/level_subset.cpp
+++ b/src/level_subset.cpp
@@ -19,6 +19,7 @@
 //  02111-1307, USA.
 
 #include <assert.h>
+#include <unistd.h>
 #include "app/setup.h"
 #include "level.h"
 #include "app/globals.h"