diff --git a/PlaybackWindow.cpp b/PlaybackWindow.cpp
index dc1132e..62aa785 100644
--- a/PlaybackWindow.cpp
+++ b/PlaybackWindow.cpp
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <pcap.h>
 #include <pthread.h>
+#include <unistd.h>
 
 #include "PlaybackWindow.h"
 #include "InterfaceWindow.h"
diff --git a/README.txt b/README.txt
index 3b2e3a6..cbf6e61 100644
--- a/README.txt
+++ b/README.txt
@@ -21,7 +21,7 @@ To install the 3rd party dependencies on an Ubuntu system, GCC must first be
 installed. If it has not already been installed, run:
   sudo apt-get install build-essential
 Then run the following:
-  sudo apt-get install libfox-dev libpcap-dev cmake
+  sudo apt-get install libfox-1.6-dev libpcap0.8-dev cmake
 
 To build the software, run the following commands from inside the source
 distribution: