we need unistd.h here

fobser · rubenk · commit 7798aa3a5d83 · 2015-05-09T13:53:13.000+02:00
Signed-off-by: Ruben Kerkhof &lt;ruben@rubenkerkhof.com&gt;
(cherry picked from commit 34ed5f948fd3b9571fa13399992fb6aea911ff4f)
diff --git a/pdns/randomhelper.cc b/pdns/randomhelper.cc
@@ -3,6 +3,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
 #include "dns_random.hh"                     
 
 void seedRandom(const string& source)
