Diff of /upexplo/upexplo.cxx [b4d98e] .. [2a855a]

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--- a/upexplo/upexplo.cxx
+++ b/upexplo/upexplo.cxx
@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #include <string>
 #include <iostream>