https://bugs.launchpad.net/gearmand/+bug/914495

--- gearmand-0.27/util/instance.cc.orig	2011-10-28 22:33:38.000000000 -0500
+++ gearmand-0.27/util/instance.cc	2012-01-12 20:02:51.303519844 -0600
@@ -48,6 +48,7 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <netinet/in.h>
+#include <unistd.h>
 
 
 namespace datadifferential {