install_helpers: add dependency libpcap-dev

refs #2519

Change-Id: I10feb52c1358cd31efe4b207e32d3c29365bbe80
diff --git a/install_helpers/install_dependencies.py b/install_helpers/install_dependencies.py
index 3d433a6..ead8d63 100644
--- a/install_helpers/install_dependencies.py
+++ b/install_helpers/install_dependencies.py
@@ -6,4 +6,4 @@
     print "\nINSTALLING DEPENDENCIES"
     print "***********************"
     os.system("sudo apt-get -qq update")
-    os.system("sudo apt-get -qq install libboost1.48-all-dev libcrypto++-dev pkg-config libsqlite3-dev socat bind9")
\ No newline at end of file
+    os.system("sudo apt-get -qq install build-essential git libboost1.48-all-dev libcrypto++-dev libpcap-dev pkg-config libsqlite3-dev socat bind9")
diff --git a/install_helpers/install_ndncxx.py b/install_helpers/install_ndncxx.py
index d5d6fa0..150870c 100644
--- a/install_helpers/install_ndncxx.py
+++ b/install_helpers/install_ndncxx.py
@@ -1,7 +1,7 @@
 #!/usr/bin/python2
 import os
 
-# Install ndn-cpp-dev
+# Install ndn-cxx
 def run():
     print "\nINSTALLING ndn-cxx"
     print "**********************"