docs: add missing dependency libpcap-dev to INSTALL.md
refs #3623
Change-Id: If14220787aeb5dad9fc88f3dfa629118b222adda
diff --git a/INSTALL.md b/INSTALL.md
index f244474..a4b40e5 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -4,14 +4,23 @@
## Prerequisites
-Building ndn-tools requires [ndn-cxx](http://named-data.net/doc/ndn-cxx/current/)
-to be installed.
-Please see [Getting Started with ndn-cxx](http://named-data.net/doc/ndn-cxx/current/INSTALL.html)
-on how to install ndn-cxx.
-Note: if you have installed ndn-cxx from a binary package, please make sure development headers
-are installed (if using Ubuntu PPA, `ndn-cxx-dev` package is needed).
+- Install the [ndn-cxx](https://named-data.net/doc/ndn-cxx/current/) library and its prerequisites.
+ Please see [Getting Started with ndn-cxx](https://named-data.net/doc/ndn-cxx/current/INSTALL.html)
+ for how to install ndn-cxx.
+ Note: If you have installed ndn-cxx from a binary package, please make sure development headers
+ are installed (if using Ubuntu PPA, `ndn-cxx-dev` package is needed).
-Any operating system and compiler supported by ndn-cxx are supported by ndn-tools.
+ Any operating system and compiler supported by ndn-cxx is supported by ndn-tools.
+
+- ``libpcap``
+
+ Comes with the base system on OS X and macOS.
+
+ On Ubuntu:
+
+ ::
+
+ sudo apt-get install libpcap-dev
## Build Steps