diff -rupN qtsingleapplication-2.6_1-opensource.old/src/qtlocalpeer.cpp qtsingleapplication-2.6_1-opensource/src/qtlocalpeer.cpp
--- qtsingleapplication-2.6_1-opensource.old/src/qtlocalpeer.cpp	2012-01-11 08:15:08.000000000 -0500
+++ qtsingleapplication-2.6_1-opensource/src/qtlocalpeer.cpp	2012-01-11 08:17:36.874461946 -0500
@@ -58,6 +58,7 @@ static PProcessIdToSessionId pProcessIdT
 #endif
 #if defined(Q_OS_UNIX)
 #include <time.h>
+#include <unistd.h>
 #endif
 
 const char* QtLocalPeer::ack = "ack";