--- cryptkeeper-0.9.5/src/lsof.cpp.old	2012-04-22 10:00:24.655295117 -0500
+++ cryptkeeper-0.9.5/src/lsof.cpp	2012-04-22 10:00:35.838624366 -0500
@@ -21,6 +21,7 @@
 #include <vector>
 #include <assert.h>
 #include <cstring>
+#include <unistd.h>
 #include "lsof.h"
 
 fsuser::fsuser(const char *pid, const char *name)